Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa02901ed745f6e…

MALICIOUS

PDF

66.0 KB Created: 2020-11-18 06:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b664e604a2b883f16689e07c7de96aba SHA-1: 581bd5b8e173ba2466e09948de131979ea1b1f7c SHA-256: cfa02901ed745f6e3b3d1d189e30d4fdb3785c6c127402fda5701ee5b397bb18
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, and one specific URL points to a router reset guide, suggesting a lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the presence of embedded URLs and the overall structure point to a phishing or downloader attack.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=how+to+reset+asus+router+to+default
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f8a073fc96cc.pdf
    • https://cdn-cms.f-static.net/uploads/4482012/normal_5fad94766c6f9.pdf
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5f94253aa5649.pdf
    • https://cdn-cms.f-static.net/uploads/4449405/normal_5fa254815c0c4.pdf
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5f9781fa38c94.pdf
    • https://cdn-cms.f-static.net/uploads/4415046/normal_5faf32bdc9cdd.pdf
    • https://cdn-cms.f-static.net/uploads/4427287/normal_5f988ab98e2fe.pdf
    • https://vezutubiwewo.weebly.com/uploads/1/3/4/5/134507618/682b2936.pdf
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5fa7ed85507bc.pdf
    • https://cdn-cms.f-static.net/uploads/4446646/normal_5faa13cde49cd.pdf
    • https://cdn-cms.f-static.net/uploads/4416789/normal_5fae6757b0811.pdf
    • https://cdn-cms.f-static.net/uploads/4410988/normal_5f9b5b6c6432c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zarelusipofox/agile_project_management_with_kanban.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_off0000c682.bin
835080960310bbb993e9a5dff910e50e63eb001e586be8e057666cdec8862f92
pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 4952 bytes
font_01_sfnt_off0000d779.bin
f2b779921e763e41879dbf5fe959de3878d8de90dfeb8dfa0267d5124ce76b10
pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 10408 bytes