Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa523da6314889f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 11:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1e900a673c0be4703f3b342d6115e75 SHA-1: e1bf36d49a943d6f72ce0659024870547bb597c9 SHA-256: 0fa523da6314889f36d06171b1acbc3656fb1b9bcb948dd6ee9990008f2029b4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO farms or to redirect users to malicious sites. 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 suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=peritoneal+carcinomatosis+index+pdf
    • http://bettyloustintruckbbq.com/the_divergent_series_full_movie_download_in_hindi_720pxz2tx.pdf
    • https://cdn.sqhk.co/wolitobutak/Pggoij5/nijatajamozilarutij.pdf
    • https://cdn.sqhk.co/motanunika/0ige6iw/used_cnc_machines_near_me.pdf
    • https://cdn-cms.f-static.net/uploads/4411512/normal_60342a8ee9b0e.pdf
    • https://cdn.sqhk.co/viliwogid/iif4hgW/matching_puzzle_3d_pair_match_game.pdf
    • https://cdn.sqhk.co/lamikolo/jd8EyNW/formula_drift_japan_2020_schedule.pdf
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/5495330.pdf
    • https://cdn.sqhk.co/sirijunubi/ijhiBig/college_hockey_games_near_me.pdf
    • https://cdn.sqhk.co/netimupoxojo/gjhbRRJ/28517756412.pdf
    • https://cdn-cms.f-static.net/uploads/4377924/normal_5fdaeb6a366d3.pdf
    • https://cdn.sqhk.co/loziromegon/m8ig6jb/highwaymen_mc_facebook.pdf
    • http://m-ryanaf.site/vosefefoguvavusogiziwunistpg09.pdf
    • https://cdn.sqhk.co/xomifinetepi/hajdVja/bufixugun.pdf
    • https://joxejiduzimomad.weebly.com/uploads/1/3/1/3/131383973/kosuzafolik.pdf
    • https://cdn.sqhk.co/favosejo/ghdjdzQ/82924034984.pdf
    • https://cdn-cms.f-static.net/uploads/4380871/normal_603c699040ad0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kozibowisenatu/lawemewamekubemodenasuj.pdf
    • https://s3.amazonaws.com/zurovajij/how_hard_is_it_to_get_a_5_on_ap_lang.pdf
    • https://s3.amazonaws.com/dudigonifu/looking_for_alaska_show_parents_guide.pdf
    • https://s3.amazonaws.com/widiku/bedsheet_painting_karna.pdf
    • https://s3.amazonaws.com/kulinisokakewi/burkhead_injury_report.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e328.bin
37c948a6efdcf53a9e810ca45da8d63f0eab03990b90f05c182f14329123358d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 5372 bytes
font_01_sfnt_off0000f557.bin
62308c76da7f9b1c3ad095efb7a6c75afbfdbce02f4ce1cfdb10620f95ec5c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 10832 bytes
font_02_sfnt_off00011a28.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 16060 bytes

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