Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c3287d49c5cac…

MALICIOUS

PDF

82.0 KB Created: 2021-04-15 02:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 75e02c32b0e0fe17bb995676313bb166 SHA-1: 39e4101a5ee2d93385ebcb6560a17411224968d9 SHA-256: 9f4c3287d49c5cacc8bc348a9a6db61c41ffabfe319e6c19e69032600544992f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one prominent URL pointing to a printer user manual lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the link farm structure suggest the primary goal is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/strik?utm_term=hp+officejet+pro+8610+user+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456685/normal_60056361288f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_604cd37e17f11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422879/normal_5fdd9d9f6edd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_604075684f68d.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/wfiffOX/to_do_reminder_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/eiaAshj/10617029082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_60496799ee1af.pdfIn PDF document text
    • http://dipufuvolog.iblogger.org/uob_covered_bond_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_606a209979a49.pdfIn PDF document text
    • https://zisibunekotif.weebly.com/uploads/1/3/4/9/134902626/4429270.pdfIn PDF document text
    • https://vowomupow.weebly.com/uploads/1/3/4/8/134846305/7775422.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/7509072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495550/normal_60007c14425e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukemujixoku.rf.gd/pac_man_game_for_windows_7.pdfIn PDF document text
    • http://kateporabub.epizy.com/sinegi.pdfIn PDF document text
    • http://jejafajiw.rf.gd/liluzegivafogiwiru.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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 5740 bytes
SHA-256: 85ee5b79d3a9c42f67e1b79728c65c19983d22b761e1a98594d1abca1efd3e1a
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 10080 bytes
SHA-256: d7aa5f9051dcc14f6adf3846946702e1c87762ddd84dc9e059b800f5f2be9bc2

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