Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b03bea7474421c…

MALICIOUS

PDF

66.5 KB Created: 2020-11-18 07:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4b61847c450236ac3aa122e2797d3ebf SHA-1: 757d6ef89f3668b93b422b9975107c8b54a7b43f SHA-256: c0b03bea7474421ce35ba784b94943e6eccb49986b935814b7e6068aa5e8b780
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content or for SEO manipulation. The presence of these links and the overall detection indicate an attempt to compromise users through indirect means, likely by exploiting vulnerabilities or leading them to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/123?utm_term=grandma+songs+youtube PDF link annotation
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/164082fef46.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/dozix.pdfIn PDF document text
    • https://lidenezat.weebly.com/uploads/1/3/4/3/134382714/pufuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_5fb3ca5b8f461.pdfIn PDF document text
    • https://merusomewazotom.weebly.com/uploads/1/3/4/5/134514041/3504517.pdfIn PDF document text
    • https://kogavoduwesexup.weebly.com/uploads/1/3/4/6/134600755/5296256.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/gewizojule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_5fa28acdd66f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f9d7e88f0527.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/cb9a7769-4461-43f7-9901-9a98ac78ad97/81929475115.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_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 5388 bytes
SHA-256: 518012a9a24ce444bbf4fe7bb84a7ed3e6e5fcaaf77dfc7616e0a0b03fc25cec
font_01_sfnt_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 10936 bytes
SHA-256: f39efceba8e5c591654bcc271221a7f4a41af515750dc6b0f23076989f9c4cf5

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