Malicious PDF — malware analysis report

Static analysis result for SHA-256 648eb0fb21634a7a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 23:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 49ac6546d4de7bcc851f5e9c85e4cd20 SHA-1: 8924ca343c017dc7750f123d01f16fdedb8cada8 SHA-256: 648eb0fb21634a7abe89e5a70f2be2f6d4f4b2737417ed74da1cffad3233fe3e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=active+passive+exercises+mixed+tenses+pdf PDF link annotation
    • https://cdn.sqhk.co/kinanunir/Eihidjg/drop_ball_blast_virus_warframe.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/cijgdRI/mine_runner_level_151.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/aAAighi/mexuwulekanele.pdfIn PDF document text
    • http://kisedevobale.22web.org/altruistic_behaviour.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/hghgheh/dino_racer_martlifestyle_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/gjehahO/85338992162.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/kShhghV/vikedogogijumoxeru.pdfIn PDF document text
    • http://sapiwis.iblogger.org/netgear_wnr2000_als_repeater_einrichten.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/hijjggd/doligijidodowamode.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/SlPihhj/lodosegadunulamaninopo.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/7boYamf/tamupasipepitiluv.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hid4ghP/68573097561.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/2iECVid/1322832917.pdfIn PDF document text
    • https://cdn.sqhk.co/sobetevod/giihLQ9/plants_vs_zombies_apk_oyun_indir_club.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bokubipojofoji.rf.gd/neteller_mobile_app_apk.pdfIn PDF document text
    • http://zirikefemeto.rf.gd/beyond_enemy_lines_2_tank_base_pc.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_852ffd56d14e4bbca60d9b555753719d.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_f7a5b158302141778374db5e7390e5fd.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_e4ad7f83f29e46029dd7fc5a1e624b1a.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_b955dea5f4b94b7891bba17ecaf76735.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_719dbd99916b461f83607e1a7c401b59.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_9227605a5abc4d4e832f66d973c45484.pdf?index=trueIn PDF document text
    • http://magivaxinel.rf.gd/baby_doll_full_video_song.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_55237da2987f450bac528cb3888fc82f.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_476ea1a5eec7405f94363b33486d685d.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_166fe3f102cf42a196cf0bb07edfc755.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 5388 bytes
SHA-256: c688e0edd8b85f6c803cc25864a1fad38c96ec3e21d394f5d21d8fdb5dbe9e06
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 10316 bytes
SHA-256: c7cf3437c194de75867303d4fab798eb80f7e57a2fb07aeb0f6741db8f97b799