Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cbebe2f447d08a…

MALICIOUS

PDF

73.7 KB Created: 2020-12-31 20:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 896efd7e8a85a0fd1c73f3a6cf8091e0 SHA-1: bc2d5b7cd9cc314623b776225d377299c7bb32aa SHA-256: 79cbebe2f447d08a82c64016ad157e1f4273a49410efaf424b10418bbca92ee4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous external links, including one to 'traffset.ru', suggesting a link farm or redirection to malicious content. The document body, though heavily obfuscated, appears to reference a research grant proposal, a common lure for phishing attacks.

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://traffset.ru/123?utm_term=esrc+how+to+write+a+good+research+grant+proposal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497370/normal_5fdd6af719b91.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/igjcLjh/18197902707.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/ihihdfx/97133375906.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/jc7ie8B/bolatomulisototidegopul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5f99102530d57.pdfIn PDF document text
    • https://libesomed.weebly.com/uploads/1/3/4/9/134904451/juber_tiposimeterog_zajufepepi_vufufa.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/18926866-438f-41a0-97fa-87175c558c43/uss_enterprise_owners_workshop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8b9ff4-5717-44fa-b9ef-70cd36030f53/33193010535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645df48d-f69c-462d-895f-82db0382b3a1/final_fantasy_yiazmat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5f1e75-ad55-4ce4-ac70-82b053c7113c/what_happened_in_600_bce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39fd14d-e267-4412-9196-dedf83866ca1/best_online_comic_book_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/luvegebosamowakuze.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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 5384 bytes
SHA-256: 21fa9d7b03bb17d8dd5929a7904dcbf2fce764aae0e433193da89d6b45503fe8
font_01_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 10824 bytes
SHA-256: e302d11333526e596c9dba7f0ac29cecccaca84523567d6d8bda533c518aa558

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