Malicious PDF — malware analysis report

Static analysis result for SHA-256 66df3a2647121b1d…

MALICIOUS

PDF

78.4 KB Created: 2021-01-18 00:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf41dd5c7c39e2ba3163af3e7e2f8d28 SHA-1: 57813e96d212f4a268edc6359b83d8f42d7e8432 SHA-256: 66df3a2647121b1d6e837e4a529c9f18ef93675cd7545a1c27dacdb1d008314e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

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://traffnew.ru/123?utm_term=abatron+wood+epoxy+home+depot PDF link annotation
    • https://site-1176507.mozfiles.com/files/1176507/vojibamutaweg.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/hhizhcU/human_fall_flat_game_unblocked.pdfIn PDF document text
    • https://site-1175316.mozfiles.com/files/1175316/74888332012.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/hegjGig/52442761358.pdfIn PDF document text
    • https://site-1176846.mozfiles.com/files/1176846/94983155039.pdfIn PDF document text
    • https://cdn.sqhk.co/bewagolene/8dzjcbE/42482875177.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/EiTwhjd/royal_family_documentary_the_crown.pdfIn PDF document text
    • https://simamofot.weebly.com/uploads/1/3/3/9/133997368/93afffca13ed959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xevorerokune.epizy.com/hypertension_treatment_guideline_2017.pdfIn PDF document text
    • http://zepedijuva.epizy.com/shabadimath_kannada_calendar_august_2018.pdfIn PDF document text
    • http://mudefikireneb.rf.gd/gijemelokopipejupimurap.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/pimuwasatokujiwuzo.pdfIn PDF document text
    • http://kagiweluxipo.epizy.com/fezafofarigiwajur.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_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 5380 bytes
SHA-256: bf81b1ddf93525977a792e967db7e944a814d7f006c697dacaed04ba634272dc
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 11660 bytes
SHA-256: 91474983ba571b28ab54f316f6e336fdfeb4247f62dfdb7059230092dd790096

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