Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb13bd86e38e5bc…

MALICIOUS

PDF

72.1 KB Created: 2020-11-22 08:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c65779e26d8410ac7f87aa72a8282e45 SHA-1: d5b1eb549feb6d784d7d9629d24ce07a3efdc606 SHA-256: 2fb13bd86e38e5bc80280f8d79ef044697349db1711e49f64279e1d52b58fd61
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The embedded URLs suggest an attempt to direct users to potentially malicious or deceptive content, possibly for phishing or SEO manipulation purposes. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=gentle+leader+dog+harness
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5fb5dd4b01ce0.pdf
    • https://rovatelafewi.weebly.com/uploads/1/3/4/3/134392743/kuvob.pdf
    • https://cdn-cms.f-static.net/uploads/4495994/normal_5fb3cdbe0ccf7.pdf
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/mifenadubuj-gemaz-biresilogi-xalewuzejo.pdf
    • https://cdn-cms.f-static.net/uploads/4481695/normal_5fb9caa8ca355.pdf
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/renezojajesume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/loneminovu/news_intro_after_effects_free_template.pdf
    • https://s3.amazonaws.com/mejawiwomak/research_proposal_budget_sample.pdf
    • https://s3.amazonaws.com/jeworurowam/44408819018.pdf
    • https://s3.amazonaws.com/timafatafej/poborul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1e.bin
26ff677dc8d83514b7f65e3f619b0b8f252dc127343dd790b91c7ec031e32c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 5116 bytes
font_01_sfnt_off0000ee7e.bin
74bb2a0818c47241f40056315f2a4c070d7013f05cb23ddb7843278761dae766		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10964 bytes

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