Malicious PDF — malware analysis report

Static analysis result for SHA-256 894472632a5efbf2…

MALICIOUS

PDF

74.0 KB Created: 2021-02-24 03:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: aaecfe30c06b96bf249a3cab03b51318 SHA-1: 69b9be6631fe8fb22898111aa477ae5382f918f1 SHA-256: 894472632a5efbf250fed2598bdbe1116d5e476f168196b40fd64a153ef5f56d
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a callback phishing lure. The embedded URL and link farm heuristic suggest the document is part of a larger infrastructure designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF format and the presence of embedded URLs are consistent with common phishing techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/123?utm_term=buy+fly+tying+materials+online PDF link annotation
    • http://wafenov.iblogger.org/limatigenubug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_603581ac31bfc.pdfIn PDF document text
    • http://arfesopt.com/kenmore_350_series_water_softener_grain_capacityhqnd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_60209a3e9d0d7.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/susodazagaxugiwa.pdfIn PDF document text
    • http://rabisoluvilava.iblogger.org/83189663179.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5ffca1ec91b77.pdfIn PDF document text
    • http://sukalobuvigaz.22web.org/95329807099.pdfIn PDF document text
    • http://presentinsta.online/jurnal_actinomycetespzu2k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5fe2a05eb54bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mobotovo.epizy.com/mafitawa.pdfIn PDF document text
    • http://povuputuk.epizy.com/41752103380.pdfIn PDF document text
    • http://vuvazapej.rf.gd/user_guide_maker_software.pdfIn PDF document text
    • http://wuvuwipiwizovid.epizy.com/selemen.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_off0000e367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 5240 bytes
SHA-256: 8ba1917039ea71df8e37c2471ff4e90a506b364343cbc6f003e5dedd8e359523
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 11132 bytes
SHA-256: d26abb39223df930a206a92ed70b36f9bd848ed101afa6550351b12f0ea03eb0

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