Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee719e92474f996…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 23:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86afbad6b05befbf506bfcbf37b9f7fb SHA-1: 634a6f4abf007548d4748e952995378312bfae62 SHA-256: 9ee719e92474f996bf0a200cedab2644b42a33b470061efab531b227b7726b2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for mass distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=watch+fast+and+furious+4+putlocker PDF link annotation
    • https://jasz-pap.hu/UserFiles/file/43289471717.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f879699e9b---zimifazodopukovaxo.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/33442049087.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/34515351000.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/bujugawumijubexasiwozaki.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/88642917790.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/pelomeru.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613836f4f0849---xomoja.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210901124350.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/35053322558.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/pezinolimegoka.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/ketafaxibesezuwizigila.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/nozalelupesubedum.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/12550865881.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/jasosali.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/mofuxopixajiwebitujagojeb.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/pinizorokilizewowumadonaj.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/62781764109.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/wulasesofolebunekum.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/38538658018.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210905014836.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/gijivogugeled.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/41141651843.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/8020078849.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 10980 bytes
SHA-256: 8183d6827d07add11641c8cbe1ed0d8102cdc16b083268109c89bf6c4c19882d
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 18524 bytes
SHA-256: 9a32d2842b1b961847ba7443f08afbcace6de12223aeb016613b580317bba4fa
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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