Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d9adde51c0a937…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 14:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8a4587a53b3409c4ad0c2a46a68e5506 SHA-1: dcad133daddfa14677bfcf8fab3e7797cc859406 SHA-256: 36d9adde51c0a937c63805fa91b80de6972d843bc6992148cdec7a65e1e9e4c3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to obscure malicious activity. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=genie+2042+parts+list, which is flagged as unknown reputation. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/strik?utm_term=genie+2042+parts+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495413/normal_6019204fb0a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_60352a117dc2b.pdfIn PDF document text
    • https://dimazupaw.weebly.com/uploads/1/3/2/8/132814154/35218.pdfIn PDF document text
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/265f9e3a2280a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484114/normal_603c2a8995e3b.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://uploads.strikinglycdn.com/files/577a9f07-92af-4743-98e7-907787188cfa/how_to_reset_2gig_gc2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7fda25-a9b8-4c00-a1fe-e31017b175fe/52395206607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1db04f0-91a5-4b34-b374-1f6f58e450b9/has_aot_manga_ended.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8306ed51-2392-4fb9-b7c8-1263a87b70f4/84462097375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2842e7e-212d-4a90-94f5-61e982a870b3/netgear_n300_c3000_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b258d1a-1d28-44bf-b595-bb65ee9d244b/mamuxev.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_9b3ea8257d2842709f5978b8e5d45e56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5bd162-296b-4da7-81ee-695dec9103fb/vuduwikod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230c4e08-6b9e-4f6d-8dbc-f273adb6b1ef/tefiremefotuxolosoxosetuf.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_6a2e1e6fc5bc46dc91250034ee3f6ecb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb893e8a-b851-4167-af0b-b9b3a21874b3/elemental_magic_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb330888-cd0f-493a-9c24-f5455b8b875e/63488616841.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_972ed43468f04412aa1a88fa9bc73a3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31584848-a12b-40b7-b716-e10278bc5d8d/best_place_to_buy_grass_seed_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac58b9e8-26b2-4f5a-ae6a-0f0f10543492/vovevixapasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427fead6-bd23-41df-9a84-aab0cca53926/resumen_del_libro_borges_y_yo.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_eff1d6a0b793449f8b5c8b8de46a2fba.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 4884 bytes
SHA-256: abb15283e922f807cfee266de4d243e59dd0c8e34a7396a387ffaa06d123a231
font_01_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 11172 bytes
SHA-256: 96fa3bb012661f3cddd05d9024094cff0fe2a74bdbfc2a9c24f802c1f7a87c16
font_02_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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