Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b09c7114ab19016…

MALICIOUS

PDF

75.2 KB Created: 2020-12-21 22:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a624e807ec56de4a1f50d709eb991afa SHA-1: 1703f51c4cb0ad1bdfb93e1f536bf9071a921d9a SHA-256: 5b09c7114ab190166824ee4ea7244b64da48b7a447905086d9bbb4728e9a3ac0
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 URL pointing to 'trafftec.ru' and a related PDF hosted on 'strikinglycdn.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://trafftec.ru/strik?utm_term=how+to+clean+virus+in+my+android+phone
    • https://cdn-cms.f-static.net/uploads/4411498/normal_5f9860e23c7df.pdf
    • https://cdn-cms.f-static.net/uploads/4409394/normal_5fc3123952fb0.pdf
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/ximamefa.pdf
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5f9145a85e863.pdf
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5f89c2351bb5d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5d164af8-805f-4353-8a7c-c482301bf123/comprhension_de_lecture_ce1.pdf
    • https://uploads.strikinglycdn.com/files/a8634a6f-7d14-4e8e-afdc-98333030f5dd/divileteveperazuf.pdf
    • https://uploads.strikinglycdn.com/files/23b889af-ab2b-4d57-8c83-4082a55e8bde/38355575814.pdf
    • https://static1.squarespace.com/static/5fc0efc3b8467722f1d478d1/t/5fccfed31e1a4d7de12d55ae/1607270100501/classic_cars_for_sale_in_maine_by_owner.pdf
    • https://s3.amazonaws.com/felasorarabipis/vetozanowaduvada.pdf
    • https://s3.amazonaws.com/toliwudalamem/18615208237.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_off0000e89e.bin
275e0aecc4a29630f268a482099de1862d47603c8b6bff34558e03583f24ea05
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 5528 bytes
font_01_sfnt_off0000fb5a.bin
1fd88ebdb2bad9ccad2530ce7cd84433f641a3d3f2e5795a4148b9376e19c74a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10864 bytes