Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f5ea10080df1c3…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 10:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dfe45f463e453f5477dfd55eb4be947 SHA-1: 7e401e057d0397e8d41e3c2b8f9893efc059bc8d SHA-256: 08f5ea10080df1c3d7fa9b23158ac7fc02bab90c1c011e112253afe36109b6da
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or malware distribution, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=2.2.3+enzymes+worksheet+answers
    • https://futisukafasuku.weebly.com/uploads/1/3/5/3/135345320/6324375.pdf
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/wivovesu.pdf
    • https://cdn.sqhk.co/ruwonumatag/fKALIjg/bixatawexoninisugereba.pdf
    • https://cdn.sqhk.co/ruxuvedije/IFgiEjj/bafimobub.pdf
    • https://cdn-cms.f-static.net/uploads/4475379/normal_6040db156f06a.pdf
    • https://cdn-cms.f-static.net/uploads/4368763/normal_60412c5d74212.pdf
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/mapuberubi.pdf
    • http://xozonline.ru/cuisinart_extreme_brewolmw6.pdf
    • http://kraftmann.su/dawebufotuwemxzipn.pdf
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/5286117.pdf
    • https://cdn.sqhk.co/dowusutitozi/haifyjd/rope_hero_vice_town_gameplay_online.pdf
    • http://barbanapoli.moscow/bounce_tales_game_cheat_code_nokiaximnj.pdf
    • http://itasummer.fun/dofodajafuxeduwuwoxuvefa7fwqn.pdf
    • http://stroiline74.ru/star_trek_enterprise_season_4_episode_12klwfr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_c263b3cf6c4849c3bd473f107cd2e347.pdf?index=true
    • https://s3.amazonaws.com/lakujusitejojet/31129143456.pdf
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_783a9d52773349afb1c8dc026f7fa106.pdf?index=true
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_8f59eca2d816417bb7dd63fe41381950.pdf?index=true
    • https://s3.amazonaws.com/lekelepowo/76960593723.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f743.bin
fda39ca582ff13446513ebfbc77a54f320f50d24ddb3216d5bbad11bae3664eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 5432 bytes
font_01_sfnt_off000109b4.bin
63fd2d2df2944b0f071ec341b6ce71be047b3c61627b1b7bb06aa95586b30bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 10912 bytes

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