Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec8be58e999db95…

MALICIOUS

PDF

67.5 KB Created: 2020-12-28 18:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0814f5dcf6deda6d96517a8307ec1cfb SHA-1: 64e6495c9bb67da3c18769b9f44b1bb6ac7ffb86 SHA-256: bec8be58e999db950343cf5bf7c4bcaa7ab325ff647bd5399a8b00a289c48180
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, directing to various PDF files hosted on external domains. The primary URL, 'https://trafffi.ru/strik?utm_term=harris+jr+elementary', suggests a phishing or malicious redirection attempt. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

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://trafffi.ru/strik?utm_term=harris+jr+elementary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5f95c7cb7bd96.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/poxogejatese.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/5354023.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/jhCJ7ib/lg_xboom_go_pl5_precio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_5fabadcd6cf6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_5fa08e12706e6.pdfIn PDF document text
    • https://cdn.sqhk.co/filomada/jagggd4/arizona_state_parks_cabins.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/whfiige/xexanilog.pdfIn PDF document text
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/be420714fe960b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5f9208c42261f.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/ihhh1jf/wutunusefivotujogezuguf.pdfIn PDF document text
    • https://xosipepimebat.weebly.com/uploads/1/3/2/6/132682768/8339781.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/g5ihvmQ/38823556553.pdfIn PDF document text
    • https://nidexopike.weebly.com/uploads/1/3/1/4/131407316/2155575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_5fd8f4e07f532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5f8f8458c0fef.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_off0000ca9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 4968 bytes
SHA-256: 8d32200f85304c6b4e240670d3a265465842de7c97e6d645682c2c4416475d8a
font_01_sfnt_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 11052 bytes
SHA-256: 1099cb75d6a1678b4f7a77c8e7b0c008df5e97c8152a8c6e66d4d22c377c7f06

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