Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a0e4578b76bd76…

MALICIOUS

PDF

69.1 KB Created: 2020-12-19 06:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6c3a40cfba431df845d3f9c0ef2a1ad2 SHA-1: 4c060eb7c6523ae9786741f155f7381ff1de8f58 SHA-256: 66a0e4578b76bd768508cf473ae5585ab70f34af366ad3bbd496a2566ff1817b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful websites.

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=life+unexpected+season+3+netflix PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fc9f5ba9e3de.pdfIn PDF document text
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/4092199.pdfIn PDF document text
    • https://lewixukulir.weebly.com/uploads/1/3/1/6/131606807/jevufavidimedokupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefe8b68-47b4-4939-a0c4-b9f65c9b413a/45810940787.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/2335779365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c529d0c5-0412-4295-b231-e54fbf3dd531/insinkerator_1-83_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b86dd5-eea7-49b7-b477-e515fbb1de28/95600373868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc1e533-810a-4a6b-9291-835de37ead1b/ac_odyssey_a_heart_for_a_head.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/86427882116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2504031-f0d2-48f4-b02c-e3095db8064c/79662557608.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe03a4cb3e0f5771154382/1606288292709/bodit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb852b4-b2f9-42ee-a286-8e7427a1cb14/toxotusojekil.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_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 5224 bytes
SHA-256: 1d5a52260462123ec795f270bebc8a3d37016e1523fa556cb71d79b964790cb5
font_01_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 10644 bytes
SHA-256: 5101fcae1f9061db7fb2a53d822d8fb6c01578f02ee77104700aecc74ccba654

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