Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a7b1940f000365…

MALICIOUS

PDF

71.5 KB Created: 2021-01-04 21:22:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: beefbff9a19496dee34bc9f2b7dc5397 SHA-1: d8abe1f3ba91d2ca9ff13ca69667ab3f251fad97 SHA-256: 91a7b1940f000365c3ff6bdf3bcc4aa17a9087da7cd2946ce17cb0bfe05e7857
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, with one prominent URL pointing to a site offering movie downloads. This strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further confirm the malicious nature of the file, indicating it is likely a phishing trojan.

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://traffnew.ru/aws?utm_term=chennai+express+hd+movie++in+tamilrockers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426823/normal_5fd1fb14dfeea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f8e3325c3c60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410004/normal_5fc7f1f6617f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_5f8af0dd2f093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_5f904b3c7376d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408991/normal_5ff1531a6e51d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f97b8924a478.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/5032723.pdfIn PDF document text
    • https://zokanebawabor.weebly.com/uploads/1/3/1/4/131438448/buzum-voxugusavu-disex-sigixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_5fb5ff34c7df9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494874/normal_5fe3ba42752df.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/69e014a8-9ad9-4bf7-a400-8ca8e5b020cd/75138208660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c278eb3-0c82-4427-b6ab-07c6c84a49cf/46143514775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8c56d5-fb30-4d7d-b442-f38be79e67fc/gamanakukobavoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b83b604-5e6f-4841-837f-97ad3b23e26c/stock_market_ebooks_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8b9ff4-5717-44fa-b9ef-70cd36030f53/33193010535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9c88b7-b906-44ee-8500-5c44863e1fbd/giant_wooden_4_in_a_row_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42344a3a-46dd-4dc5-ae4b-4fd2b872cfd7/eus_guided_cystogastrostomy_cpt_code.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_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 5408 bytes
SHA-256: 45ddadebeed8839d9a6212e670319dba4b01d0d11c9d2230aa10a144dea1ccf7
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 11092 bytes
SHA-256: 5d6bf68dd412e0373dbf6f6678c904b384b55bd34f5a2112304a9b4e8fd69137

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