Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0b43746068b0d9…

MALICIOUS

PDF

57.5 KB Created: 2020-11-13 16:39:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f554923ed2fb7ff66e96464a60b8f21f SHA-1: 4568ae2ecf5762975f47bd5712aea361281e58a5 SHA-256: ab0b43746068b0d9367216b199f9adac54e8c6e1dafefe80ebe3978c91f127ca
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing campaign. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=glen+burton+guitar+gun In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f8844ad58f3a.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/nugedub.pdfIn PDF document text
    • https://gulawunobuxag.weebly.com/uploads/1/3/4/6/134627092/wavediz.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/2056538.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/9827515.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/titozukuvevefon.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/vedoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/neboguxobebetopimiluler.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/kiduta.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/segway_no_handles.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_off0000a658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA658 4844 bytes
SHA-256: 5f9062e4cbf2f143f5e3699ef3dfc49bf592d4b89bb22ff9e0bb408d846be3b0
font_01_sfnt_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 10192 bytes
SHA-256: ca385514d0b2ab23ac58eda20e222661aa0d682fa2e05d419947da4f1e9449b3

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