Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27ac43fd794b363…

MALICIOUS

PDF

50.6 KB Created: 2021-01-06 16:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc9a69d0f0bae6ff86b23bc10bd358f9 SHA-1: 2d62b32616b64ee729c977fb7b644c3d6f1980eb SHA-256: f27ac43fd794b363070e3d8672cc03c809a01373c6404188c3328a575f011c00
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains links to known malicious redirectors. The PDF structure suggests it's part of a link farm designed to lure users to potentially malicious sites. No scripts were extracted, but the presence of embedded URLs and the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7801

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=christian+worship+songs+english+free
    • https://neboxikadifi.weebly.com/uploads/1/3/4/5/134588308/664060.pdf
    • https://cdn.sqhk.co/waxipefimafa/hexYggY/26784703768.pdf
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/misekelowip.pdf
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/638f8f6bd.pdf
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/romunifif_xejesizufo.pdf
    • https://cdn.sqhk.co/zururodi/cijhhN7/bingo_battle_team.pdf
    • https://ginekimef.weebly.com/uploads/1/3/0/7/130738874/dudoliveg-matevedimel-mifus-fozirikipu.pdf
    • https://cdn.sqhk.co/zetanitanedo/gja8Phj/38647583096.pdf
    • https://fujidefabez.weebly.com/uploads/1/3/4/5/134512048/seleposegewasi.pdf
    • https://uploads.strikinglycdn.com/files/7871401a-3f7a-4007-972d-e1ef4d96f8fa/rewubixa.pdf
    • https://uploads.strikinglycdn.com/files/e42e15bd-3098-4b85-8d95-433d7a3ef81b/24564336065.pdf
    • https://uploads.strikinglycdn.com/files/3cb07ea0-d5c3-442a-a0fd-79f0c8e43ae9/46243021921.pdf

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