Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b4bbd9e39045b5…

MALICIOUS

PDF

103.9 KB Created: 2021-06-11 14:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0490a32bbaff4cfc17989b075c18ef8c SHA-1: d527b974be7f382e8e05276e0e711f59fdc84648 SHA-256: c2b4bbd9e39045b5b7c5f35e1dec7887c645e7db0e4d840c6e0c9ff7b449fe67
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/pbw?utm_term=name+an+alkaline+earth+metal
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/galuk.pdf
    • https://cdn-cms.f-static.net/uploads/4448331/normal_601d6f564c10b.pdf
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/subaliv.pdf
    • https://gafujoneruxuf.weebly.com/uploads/1/3/4/7/134728567/vosowunuzimaka.pdf
    • https://cdn-cms.f-static.net/uploads/4448103/normal_60c2380de4a8c.pdf
    • https://koxewujinam.weebly.com/uploads/1/3/3/9/133986689/1806183.pdf
    • https://cdn-cms.f-static.net/uploads/4382621/normal_605f74838b53d.pdf
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/3877537.pdf
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fe099d429dad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zekodunu.pbworks.com/w/file/fetch/144628845/mekabufimabopunu.pdf
    • https://uploads.strikinglycdn.com/files/17706df0-70c9-4936-a532-0f6689350a85/romizuxi.pdf
    • http://tagexoba.pbworks.com/w/file/fetch/144423330/girerabujiwalitotopizad.pdf
    • http://jetubabup.pbworks.com/w/file/fetch/144932142/car_res_game_download_pc.pdf
    • https://uploads.strikinglycdn.com/files/a7cfeab8-4e7e-466c-8bd1-63a588c58a23/therapeutic_foster_care_vs_regular_foster_care.pdf
    • https://uploads.strikinglycdn.com/files/985e147e-a7ff-4f7a-933f-8bff13712954/dog_man_fetch_22_book_summary.pdf
    • https://uploads.strikinglycdn.com/files/cf6cfcf0-7d97-4b17-b267-bfac3147716d/86244563367.pdf
    • https://uploads.strikinglycdn.com/files/a92048fd-b786-4777-9a62-f841218a6b43/abstract_reasoning_test_5_with_answers.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_off00015847.bin
7c54fc2ede739393b166c365e9d39173afdcea48a13b5f240d0f3a57f346513c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15847 4780 bytes
font_01_sfnt_off0001685e.bin
71b8b3e02502877247875dfce10658e702c7a6375b2240716b1c22304f24fef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1685E 12760 bytes

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