Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b465732fbd67f8…

MALICIOUS

PDF

66.7 KB Created: 2021-02-20 12:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f295129af0f2c5ad39c688942c97a9cf SHA-1: 998bd283521908a1d0f7c287a4d966c375beec59 SHA-256: 04b465732fbd67f8a1537705869e1f9c7bae42400c63ef5ef0caf400d5628272
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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=the+manual+w+anton+pdf+download PDF link annotation
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/4673520.pdfIn PDF document text
    • http://summer-italy.fun/begasezaradetawipovopesobxsoon.pdfIn PDF document text
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/7688327.pdfIn PDF document text
    • https://sumiloruxefeme.weebly.com/uploads/1/3/2/8/132814276/24866d3.pdfIn PDF document text
    • http://apparently-home.com/us_work_permit_application_formg28fp.pdfIn PDF document text
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/lofofi.pdfIn PDF document text
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/2650e217.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/selulobilafobi-lavewijekot.pdfIn PDF document text
    • http://baxemoge.iblogger.org/rurajevobidigibavuzeruzow.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/9234385.pdfIn PDF document text
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/45699f947c9ebf2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luremugaxufarup.epizy.com/59559299548.pdfIn PDF document text
    • http://pedefulavok.rf.gd/used_jeep_wrangler_2_door_manual.pdfIn PDF document text
    • http://felixoxajaxev.epizy.com/february_2019_month_template.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_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 5048 bytes
SHA-256: 502e6c49f774ac31130ebf95906137c8d8bbf1a045dcf6e975910e47aba01ff1
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 10544 bytes
SHA-256: 40f390594f309036a45677c1c6728c5a4c9cc9a6585c25af7152cdad6c31df33

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