Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc2c846148a2fd5…

MALICIOUS

PDF

85.5 KB Created: 2021-04-02 22:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: aa218c8a6dd0152f1c6b181efe27870a SHA-1: cf6e0a678c85e3b2f6568763a717147d0ccd954d SHA-256: ecc2c846148a2fd59addcde64401b743ffe96859dbdb1efd418db93f425347f2
194 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to various other PDF files, likely as part of a phishing or SEO manipulation scheme. The presence of multiple external links and the ML classifier flagging it as malicious strongly indicate a malicious intent. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

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://pelibifir.ru/strik?utm_term=the+rapid+fat+loss+handbook+a+scientific+approach+to+crash+dieting PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489440/normal_6042dc4f6e764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_600523ff1ebce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490141/normal_5fd3509fe8bb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_6036ff12af68b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_60367f376edd0.pdfIn PDF document text
    • https://lukibufipijuzom.weebly.com/uploads/1/3/3/9/133997252/xesevizakoxojovoxib.pdfIn PDF document text
    • https://sonalopuxarore.weebly.com/uploads/1/3/4/3/134310538/leluromanutugurew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_6042c5272b970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459468/normal_5fe561fa9ff8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_6046567d13a20.pdfIn PDF document text
    • http://givepamodugag.22web.org/interview_confirmation_email_template_from_employer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/261e28e5-a40b-4cc4-afa3-c1d339e844fa/xugez.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/winrar_free_64_bit_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/wivonomez.pdfIn PDF document text
    • http://matiwusaned.rf.gd/body_temperature_measurement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee7c775-0287-4255-8c6a-29187e917e9f/lilasazotodaxunozuraf.pdfIn PDF document text
    • http://xasagofawidi.epizy.com/biometric_attendance_system_over_iot.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/zefaxawojubeladofe.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_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 5572 bytes
SHA-256: 03a1f0aa1f9c6ec48459843927d359d3892f27c929902bd8ec749cf383263a22
font_01_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 11468 bytes
SHA-256: eed7e179fa61873ffae37c645af262fc5d8aa05d26f1c9d78ca4541bdec9ba58

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