Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a85dad3dcaf7e1…

MALICIOUS

PDF

73.4 KB Created: 2021-06-04 20:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0319c6949a23334b6822f2f1cf768abc SHA-1: c8c0017ea9e9882c5f67dbd2a8199405a7b5df1f SHA-256: 41a85dad3dcaf7e13b19b7f74a63f2c1bacba03c77c62800b14f321395ac329c
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily corrupted, contains references to 'Google slide trifold brochure template' and 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/123?utm_term=google+slide+trifold+brochure+template PDF link annotation
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/munojozugizitobigexu.pdfIn PDF document text
    • https://vevofuxideg.weebly.com/uploads/1/3/1/4/131405958/mexibumagojala.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/a825c568dca.pdfIn PDF document text
    • https://xubupatulebo.weebly.com/uploads/1/3/4/7/134701573/delapekojig.pdfIn PDF document text
    • https://tanipodolotuweb.weebly.com/uploads/1/3/4/4/134457000/timobofiz.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/135927.pdfIn PDF document text
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/gezikovisuwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144545211/piano_notes_chart_36_keys.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/49709471984.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/biblia_cronologica_reina_valera_1960_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9fb5907-1036-4db1-b864-0433aa38494f/korimadokogepaviwud.pdfIn PDF document text
    • http://buxozodevoge.pbworks.com/w/file/fetch/144613392/76770530799.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/mazutunanifisuke.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/17441492685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf23c026-33b4-4e63-8223-941079b5815c/62057687340.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/24500522515.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/buy_nursing_textbooks_online.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/f/soral.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 5740 bytes
SHA-256: 0e7deac3934ac98dfef16ad7d21e1d0a6aaba24f20a61e90effea8f067f4d5a6
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10348 bytes
SHA-256: 0d53a4eb1951e8731e736b249e38c59137502298709ba62571fa97186d654082

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