Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8d4fd979c67c78…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 20:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2a7951de04d856f6ea33f345f2a46680 SHA-1: 2a46abe584b56537c3fb36577a88547714c9743a SHA-256: 4b8d4fd979c67c78c46d2089ac2ddfe401aea679f351f16277e2d2394218a0e0
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may lead to further malicious activity or phishing pages.

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://baarspo.ru/strik?utm_term=why+is+experimentation+important+to+develop+skills+in+drawing PDF link annotation
    • https://cdn.sqhk.co/velabolo/ihWiajh/22876298127.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/XTgfigT/magic_mod_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/pugusomimoro/pzgjgh6/6053929943.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/kgejhyB/48235674449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454056/normal_5febf337cc7ea.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/bfd5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_601b5f4c506f9.pdfIn PDF document text
    • http://gelipuzag.iblogger.org/banded_iron_formation_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/3uhfshe/cheap_international_calling_cards_to_ethiopia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_6017039fa4f25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5fcaf8e387a7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasadokejofis.epizy.com/33779171104.pdfIn PDF document text
    • http://mikusadetov.rf.gd/questions_answerable_by_yes_or_no_only.pdfIn PDF document text
    • http://zifiroduvibo.rf.gd/juvezerux.pdfIn PDF document text
    • http://ronaripijamalon.epizy.com/61086290283.pdfIn PDF document text
    • http://nasuxenabo.epizy.com/85509281505.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_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 5772 bytes
SHA-256: f54a891e437985397006b15d8bcdcb1de2bcf8197bbd921d7292801115469f31
font_01_sfnt_off0000e892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 10560 bytes
SHA-256: 60ba1cbfb01c8d0fe606e74b1e6007b011f080286dbc87d06662af22d46ef3ae

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