Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e40e0ff845250a…

MALICIOUS

PDF

79.3 KB Created: 2021-03-30 09:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 455fec74922d33499d763b65a90d40b2 SHA-1: 2a31f9b865fc22ead258b5771401f501cca75d92 SHA-256: 96e40e0ff845250af0b7a02368e27fac9acb5dd34a7848a5d63a2a037aa62115
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, which is a common tactic for phishing or SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=metal+gear+solid+v+the+phantom+pain+mission+1
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5ff002f7ac946.pdf
    • https://cdn.sqhk.co/pirasemofoge/1XPjaja/snow_white_movie_2012.pdf
    • http://idealica-it.website/general_agreement_contract_format3jg1g.pdf
    • https://cdn.sqhk.co/fofodafexadu/lZih0hd/larajilubukazozokolejexez.pdf
    • https://cdn.sqhk.co/tomubozes/Vhhihis/7_little_words_game_answers.pdf
    • http://robertferrell.net/difference_between_tu-2_and_tu-31kaa5.pdf
    • https://cdn.sqhk.co/nowegizin/cvjdcgf/pacsun_cyber_monday_coupon_code.pdf
    • https://cdn-cms.f-static.net/uploads/4390092/normal_6058e1d8e7aa0.pdf
    • https://cdn.sqhk.co/xovujiroveg/gjc5icf/vurijaru.pdf
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5ff844968518f.pdf
    • https://cdn.sqhk.co/jojikoxazew/agdFvd3/gaxos.pdf
    • http://ourfanz.com/518772505959hkha.pdf
    • http://usacreditcheck.info/nedelatukudoxugerepobih3u8r.pdf
    • https://cdn-cms.f-static.net/uploads/4421210/normal_6044d6b1cc52e.pdf
    • https://static.s123-cdn-static.com/uploads/4469349/normal_5ff8fe6168fea.pdf
    • https://cdn-cms.f-static.net/uploads/4412160/normal_6027ca6043908.pdf
    • https://cdn.sqhk.co/zekafomaze/idhagcj/44066416006.pdf
    • https://cdn-cms.f-static.net/uploads/4365628/normal_603146db67f91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_18c302f369e54401bb83e89ed1c0bf4e.pdf?index=true
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_f9d1fd1b09d941398ff35ce705083aad.pdf?index=true
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_c032bf2af1ff44539bb20aff9d346644.pdf?index=true
    • 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_off0000f772.bin
1a30f53d570fea9f3f66a546f238f6327d78b31e7523325fe6f735c4230196ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 5488 bytes
font_01_sfnt_off00010a0c.bin
f073a73aa5f9d80c0d79208f125a92631685c6fb6f274020634dbc55fec7374e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 11100 bytes

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