Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f758fe23813238…

MALICIOUS

PDF

72.6 KB Created: 2020-12-23 08:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 612b6159bdd0c0c6044078079bf9cd81 SHA-1: d45292ee42bc3aa2e663cf65f339b535d8df4e37 SHA-256: d0f758fe238132389283c0a43c7db64328f382623f59a741a8a83d143975b515
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for link farms or phishing campaigns. The heuristic PDF_SEO_LINK_FARM and the presence of an external URI pointing to 'traffnew.ru' strongly suggest a malicious intent to redirect users. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high likelihood of malicious content, possibly embedded within the PDF structure or via obfuscated JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=unblocked+all+your+favourite+sites
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5f99d2a79c095.pdf
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5faafde48df3f.pdf
    • https://sosuwijanifoval.weebly.com/uploads/1/3/4/5/134515130/jarunirinekob-xiwus-batajase.pdf
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5fd926b129e08.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/donake/galigafapulikakopadazeba.pdf
    • https://s3.amazonaws.com/nitidadufetenu/irs_form_charitable_remainder_unitrust.pdf
    • https://s3.amazonaws.com/pulujolatepuv/71235173802.pdf
    • https://s3.amazonaws.com/xomudufe/doc_martens_uk_size_guide.pdf
    • https://s3.amazonaws.com/fixararololu/employee_performance_evaluation_sample_phrases.pdf
    • https://s3.amazonaws.com/tokudapele/xobusifokamuserofotal.pdf
    • https://s3.amazonaws.com/napisakaluja/loruxokogivewis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d9.bin
cce934bc4acb075259b595df3455b105743b71dbbf543bdc003beca86fef41b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 5256 bytes
font_01_sfnt_off0000e2ca.bin
4b906eadbf4b0b8efad010b5b6abf7fe70cc4b50c555ea78e36a83e06c7ce6af
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 10776 bytes
font_02_sfnt_off0001078b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 4324 bytes