Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fd54704b3fe74d…

MALICIOUS

PDF

74.3 KB Created: 2020-12-16 06:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35ad61f032a15765e0aa6ff9e9f2c041 SHA-1: 12c2854256dbe4b487e6b6a6562b8152bc04bc10 SHA-256: 41fd54704b3fe74da79ecff70919af3a63b61be981519488c806608a559b42ba
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm hosted on disposable domains, with a high ML score and ClamAV detection for phishing and trojan activity. The embedded URL 'https://trafffi.ru/123?utm_term=my+boy+full+apk+download+free' suggests a lure for downloading potentially unwanted or malicious applications. Although no scripts were explicitly extracted, the PDF structure and external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=my+boy+full+apk+download+free
    • https://zopojidiluze.weebly.com/uploads/1/3/4/3/134361294/ziworevi.pdf
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/08f23cb74949e63.pdf
    • https://melazikadoxu.weebly.com/uploads/1/3/4/5/134594637/widajadiz.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/439fe.pdf
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/6334607.pdf
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5f9ea20539c52.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5740abdb33045eee0e015/t/5fd601880f11661d4c21703d/1607860622758/wujasulivirupekebufun.pdf
    • https://static1.squarespace.com/static/5fce13e37d85b15ca79f7857/t/5fcec05c1b45e152edb291e6/1607385181202/ipad_pro_10._5_mic_stand.pdf
    • https://s3.amazonaws.com/bawalidamovidud/keto_custom_meal_plan_free.pdf
    • https://uploads.strikinglycdn.com/files/475e5ab1-584c-4d6a-a708-253a1292ca43/lagojen.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe3b3a2dd96f5918b9e14b/1606302524647/kekufitazuw.pdf
    • https://static1.squarespace.com/static/5fce0b3506af1e3f448b54fd/t/5fd1959ece71ee580fa58298/1607570846938/mibopup.pdf
    • https://uploads.strikinglycdn.com/files/5dfac476-10c9-4fe7-b033-b81b38f6d6ca/myron_mixon_recipes_brisket.pdf
    • https://static1.squarespace.com/static/5fc2b9efbdb33045eece00d9/t/5fc8fc6bdabc7d38e62acb82/1607007339849/xozitukizu.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_off0000c978.bin
ab5d430d1bfee35b624748117757da889327e9902e4079f15ff08c06ad5d5abd
pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 5260 bytes
font_01_sfnt_off0000db8e.bin
9e33040d9f0c9655dfb19ca45ed462a24ba99468a56829245567b505450610ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 10104 bytes
font_02_sfnt_off0000fe3a.bin
19d41018728d156678b46f4157920d082ccd36440aacc22fa96fd5eda8b191a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 18816 bytes