Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c5cd90f41a94f7…

MALICIOUS

PDF

74.1 KB Created: 2020-12-15 20:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a9595bb3d9100c5371f880cf7c20b3 SHA-1: 1fdb0656c17f924b757ccdad9232b77333bed0d7 SHA-256: 00c5cd90f41a94f7107de2fa7bf99d8b8d2e874716cbba65159bad07d8eea2aa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'trafffi.ru'. This suggests an attempt to redirect users to a malicious website, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, and the PDF structure with multiple external links aligns with SEO-based link farm tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=warrior+cats+firestar+pictures
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5fa07d87d5a03.pdf
    • https://cdn-cms.f-static.net/uploads/4445320/normal_5fb97d877e45d.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f897d5130a59.pdf
    • https://rulozakowix.weebly.com/uploads/1/3/4/7/134730123/946629.pdf
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f94efad2ba84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbfd1e0c89e1c4b8fb81223/t/5fc0d7743c02f22b9d2cee8a/1606473589853/umass_lowell_spring_break_2020.pdf
    • https://uploads.strikinglycdn.com/files/7b0c3564-488b-40f5-adaf-64b3655b08f5/69579027787.pdf
    • https://uploads.strikinglycdn.com/files/5db3c621-d877-4ced-9fa0-de06681e4b39/xutepunasi.pdf
    • https://uploads.strikinglycdn.com/files/467cc8da-70f5-488d-b5fa-baa0bd1c99a8/23073267473.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0c4264be903ae6427275/1606224963140/12024864049.pdf
    • https://uploads.strikinglycdn.com/files/29f14d64-8183-461f-9f9a-ffe985e8532d/zotudatunuvorov.pdf
    • https://uploads.strikinglycdn.com/files/00511aa5-2b35-400d-8140-90968852f3c7/79094389574.pdf
    • https://uploads.strikinglycdn.com/files/b89f9599-36f8-40b0-9e43-9618fcf08eea/pitenizopitezufa.pdf
    • https://uploads.strikinglycdn.com/files/106e6847-f482-4ad4-8cae-cf54ff8847ae/hack_avakin_life_mod.pdf
    • https://uploads.strikinglycdn.com/files/3d65d495-aa0b-4227-8e26-c1d2525fbb07/lomifadisenokerezunufeli.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_off0000e6ca.bin
bbe11ab2abef4ec8cf704f15ea53f5480052927549ab2df703997a2120a2ab6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 4992 bytes
font_01_sfnt_off0000f7e5.bin
0e447ccd11dcfdd8179eb446190e6fe056237bdc4956130db9bf958a444630b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10508 bytes

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