Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2c5dbf1975ab71…

MALICIOUS

PDF

99.4 KB Created: 2021-04-16 12:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 15a7a9e0c69e5a645054f1044e498be7 SHA-1: 7710975a8efc75a6b9a2a400faee1f9a1ec6c864 SHA-256: 4a2c5dbf1975ab715da40378a054b806cab68aa93eeef3160a7c449f895d5429
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=learn+arabic+pro+apk+free+download PDF link annotation
    • https://cdn.sqhk.co/wovenebi/ifgcidj/download_screen_stream_mirroring_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/fjhaii6/100_meme_song_buttons_memes_soundboards.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/irjizkt/bein_sports_tr_izle_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/rusefijow/1ibhfZU/ding_dong_cake_recipe_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/8yibhgh/mofutidumesolafora.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446914/normal_5fc6bbdb8bf4a.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/Kjfyyha/jezuwozuwejebozedowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_60258fadcc7be.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/Xlihieg/oconomowoc_news_fire.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/bvXjDhh/truck_accessories_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/ibI3eqi/relikojilut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5fed6507e49b6.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/ijjbhcF/76590654062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_60511e1bc616a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_700f4f06beba4ce2a41babce4bbf0849.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_f49cf8aeeab64d2c953323ac6f5cc6d1.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_1bee4672d93745aa908618dd960f5864.pdf?index=trueIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_2b8a7ceed7ce4ef7b1deb5ccc1368008.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_fafe90f1ed0f4394bb61b91a5976481c.pdf?index=trueIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_35fc0b995e2d437c8be819301ea1823e.pdf?index=trueIn PDF document text
    • https://229013d5-0e14-4531-be8c-43df84542e77.filesusr.com/ugd/e4a895_87560ac9fea848dc902a3ed140c83076.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_a9fb722cc60e4c02bc1be8b9433a7646.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_132c381bba49432ca1f8da52bab9e5ba.pdf?index=trueIn PDF document text
    • https://a5f97fb6-6895-4a42-8c51-2de4018fe37d.filesusr.com/ugd/1eae48_7e188045943a4b8e88f046954343d22c.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_6b126749127740de9d1497eadedba51e.pdf?index=trueIn PDF document text
    • https://9c8f49e5-5895-4656-bc53-c560b1a0ede3.filesusr.com/ugd/0f7a6f_72a068579186427f85c84c40a9cef901.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_e678a99da344476f93cd431f6c27167c.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_603d3a75d89741bba970123eaed5d81b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 4916 bytes
SHA-256: c174f5585ef9e56efea59692517281e6dcf5dc9b34253102e17c861cddfd5376
font_01_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 9324 bytes
SHA-256: 131f554ead8bc729da5cf992c71372d6a24c209c4fc2f418f405ca9e2db7591f
font_02_sfnt_off00012ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 12040 bytes
SHA-256: ed6ad0a62418b848247168fef8dfef477e39c1de8282ecec8030c6d21f894ba4
font_03_sfnt_off000158c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C3 16864 bytes
SHA-256: ae5a6474e3f2fe638cd45b924ef04427827cd1869314da261c0a8f169e8a9d8e
font_04_sfnt_off0001700b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1700B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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