Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c1fcb8e34bc709…

MALICIOUS

PDF

70.1 KB Created: 2020-12-14 06:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0f3e5fca13f5ef445a6d71c3be337308 SHA-1: 8ceabbaa3dfa0b8ffb8d42434447838a0a76149b SHA-256: 90c1fcb8e34bc709ec7fec04ec096e636bfa143b46a318216e80e2cd8c59a5df
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and contains a large number of external links, many pointing to disposable hosting. The document body, though heavily obfuscated, suggests a lure for a "free download" to entice users to click on these links. The presence of numerous external links indicates a link farm designed to redirect users to potentially malicious content, likely a phishing page or further malware download.

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://trafffe.ru/123?utm_term=first+aid+2016+step+1+2020+pdf+free+download PDF link annotation
    • https://kovegebefubiz.weebly.com/uploads/1/3/4/6/134665714/e07a419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_5f8f8f3dc8698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fa43e8507121.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/44355444dee15.pdfIn PDF document text
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/wofutolufu.pdfIn PDF document text
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/didepenuzukuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_5fcbbd4d29cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fbe00b8c8502.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/tobador.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f872bd0c19c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_5fa70bb0250d4.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/wonoti/wizilasiduxubasusuresavuk.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/business_administration_management.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_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 5564 bytes
SHA-256: d63be2e360a0ad4512370e55a8720d769caf2e752b86024eda032bb328092156
font_01_sfnt_off0000e5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F0 10936 bytes
SHA-256: d7c48d6cfcb1e24e66b29e23f2525318e5757e88ba98e540b367a10bbde40aad

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