Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d7e9efc88e96a1…

MALICIOUS

PDF

129.8 KB Created: 2020-12-26 00:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bb7309ac9ee1fbd91b7d3d9caf48264e SHA-1: bdad1403f983baaeb8682237a4baa18e47cffe20 SHA-256: 80d7e9efc88e96a19157e1f6a596b015155c3d58cb8ac039ea213c3bddd35d67
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of a malicious ML classifier score and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malicious redirection attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=extreme+bowling+challenges PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426261/normal_5fe66695a821e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fe5fcbd8c331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5f8d66e6d933e.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/dofokikezupas-sinibuz.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/mipel-zasedogi-tutesirinuroz-wenesinegonumav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5fcbafb0738db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447258/normal_5fa70bbf2c65f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_5fa6377c6c0f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f9a4ed9e0e20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5f984d2b1e33a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406463/normal_5fc4b2c990cbc.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/legenapi/41835206107.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/reading_pictographs_and_bar_graphs_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3933758a-7f6e-4ee9-8731-7b5d3336bcf4/names_starting_with_so.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_off0001bde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDE8 5468 bytes
SHA-256: 07062de65f1b5ceda4311b5f61e22a1d003d2411d34219abf7f0c66a626bc2fe
font_01_sfnt_off0001d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D075 11816 bytes
SHA-256: 9429d2725b05fd612d5da3f8f9d849f444ad74d36db86dda5c5bdffd88107830

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