Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5de17f548e58535…

MALICIOUS

PDF

75.0 KB Created: 2021-09-14 08:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ad8638e330d8317756a6c9368b2a1b6 SHA-1: 23726745055505e0ad19908cae30d3f874360b20 SHA-256: e5de17f548e585351a365b0afcb517dbff2c394db672de3d9139a40fb0b19ab4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a malicious intent to distribute content or redirect users. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it is likely a phishing or malware delivery mechanism.

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 http://toyotacri.com/userfiles/files/vomutamufikume.pdf In PDF document text
    • https://lostfoundglobal.com/userfiles/file/5820000830.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/tejafaketakujijalibafuf.pdfIn PDF document text
    • https://htchninc.com/d/files/vifeginomiwarineduxemika.pdfIn PDF document text
    • http://strandedtattoo.net/file/60768606894.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/wajuxusebinosoxidakukazeg.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/28419844040.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/gafufutezategad.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/59108922132.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/94980760363.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50553675926.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/galikuferamonenurovoted.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/86057102119.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ruwetanijupexutak.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/24897864874.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/29756918696.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/lokosipa.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/zerivovedoxametibisavu.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/80451294664.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/gemamopebuve.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9ff41khv0sraa074k05am806sa/65724525708.pdfIn PDF document text
    • https://aokman-drive.com/d/files/36008261038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tekken+tag+download+for+mobilePDF link annotation
    • 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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 16768 bytes
SHA-256: 1543a0836b24a6867ad43819b78aa17a6232e26a543b209081e7bf3ddb41d728
font_01_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10812 bytes
SHA-256: 770707b240744702711abaf2eb5205fdabd38722f84277f22ca921000e8c57d0

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