Malicious PDF — malware analysis report

Static analysis result for SHA-256 8463b1fe31a63543…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 14:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a41149f681aa2eabffc1cfb1098a7a8 SHA-1: bee2d00591f407a164b02ca3655d8008e9b40668 SHA-256: 8463b1fe31a635431da30122d56de442cbba4cb882fa942f28b46a4674d6a3f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a ML classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the overall behavior points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ortopediaszombathely.hu/editor_up/renilukaxulagubedubas.pdf In PDF document text
    • http://creationart.hu/files/file/53126679127.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/4868036765.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/jigitujodadupedetonuwulir.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/tuvojafozabepazofober.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/milugod.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/mulikararinevarujivunopu.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/27720481727.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/84102206899.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/10168817014.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxowen.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/4476112094.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/20351407293.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/13451893058.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/zeziretalo.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/paxokadojoseg.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/vedazozakadaro.pdfIn PDF document text
    • https://ms02bet.net/contents/files/98913458575.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/63790462730.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/89529503105.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/boliwunonumamoguz.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/sajemulinojine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=vertical+bar+chartPDF 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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 10044 bytes
SHA-256: 571655f766e2c2946bfc2cf001b696e87f372aca62e8695f0c688b7c091853a3
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 17812 bytes
SHA-256: 5ebf0b8a79bb9975f8446b2583d1ba1ecf08f0704ab0bb733e00115f31ca49fc
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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