Malicious PDF — malware analysis report

Static analysis result for SHA-256 8769071e211c02db…

MALICIOUS

PDF

76.2 KB Created: 2021-10-10 21:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c2cdefafcc443fd1a176f6b4da187c8 SHA-1: 05128cba55158bce343bbdb21a27fa50bd68704e SHA-256: 8769071e211c02db3d1812032999d679659fe1e5c6ee18ab44bca0357e7dbc29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are embedded within the PDF structure, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=old+man+jerking+off+solo PDF link annotation
    • http://aj-freight.com/ckfinder/userfiles/files/85671155194.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/gasomodevuxi.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/74824487211.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/56577115053.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/rogivexa.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/75028640026.pdfIn PDF document text
    • http://www.pvvc.cz/files/26674486501.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f3795585db3cc00392c8a3c9be67cc01/dufigemilogofipawida.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/pukunavesujosejujopenekuj.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20211006/1913421637.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/25865102108.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/kulepolewi.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/vavajefigiji.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210913074701.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/mavabiten.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/77120367308.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/37098380880.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/i2jsdgampie1t9mohg1mu21tbu/gugejaxazuxo.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zemuzutajefureniguk.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/jobinitofazamosodirogi.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/23046220040.pdfIn PDF document text
    • http://sciattella.net/images/file/togubitobapuvogigikiguza.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_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 16272 bytes
SHA-256: 3b935056033a51f772cd03b58b0137234b27e2c5886cdc8e7cade2d171d9295a
font_01_sfnt_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 10844 bytes
SHA-256: 2f24e784432ab616160fdc28e4f5db11248df0f172c69795e5ec868c672f6209

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