Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba40b25d86f8d6c…

MALICIOUS

PDF

76.9 KB Created: 2021-02-19 19:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 48a929c6d4e0f5ac1909b65e3611730a SHA-1: d458716561fda6c091625aedeaf6c959173535d5 SHA-256: 8ba40b25d86f8d6ce94f82289971bab4cef24938830ca9e0abdbca2f703d533c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier as malicious. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL being https://baarspo.ru/strik. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious or deceptive content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=define+gate+control+theory+in+psychology PDF link annotation
    • https://cdn.sqhk.co/segenapiza/hcDPxoh/84776921641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fd5f34f6f2a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_6019741bcc083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_5fe63b3fe3353.pdfIn PDF document text
    • https://cdn.sqhk.co/xotolodi/diayhcO/95522660722.pdfIn PDF document text
    • https://cdn.sqhk.co/leloxoreje/euAdAja/infectious_disease_specialist_salary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369905/normal_600960d209203.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/wijebutagase.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/i2WYUZJ/my_little_baby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_601c86de4d9bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475720/normal_5fc96d674c274.pdfIn PDF document text
    • http://shopwithsale.website/92627714766ro199.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/j9hcNge/50254978184.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/gaL3vBv/25996082496.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/33605ad.pdfIn PDF document text
    • http://italywow.space/whmis_safety_data_sheet_for_gasolineiuc6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_601059bb6e02a.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/fbjbmcT/black_friday_walmart_deals_2020_ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 5380 bytes
SHA-256: 0933211d8bb7da204e20ad6f370626d7a253a0f6f704322968afc440865f509c
font_01_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 10916 bytes
SHA-256: 948b847165329719a9f32806874dc87da49b3b9b7e2b7a2bff1b71f0acebbff4

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