Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ff5071980d6191…

MALICIOUS

PDF

67.3 KB Created: 2020-11-10 08:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57142c7dfa4bfe231d93a06252cb0f99 SHA-1: 185dbc2c1f83d75d1a9c4938a3ae23a90fc4a587 SHA-256: e1ff5071980d61911ce3d3a93cc92df757174d3140a1b70687a9dd787f78f3db
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The primary malicious activity observed is the presence of a large number of external links, including one pointing to 'trafftec.ru', suggesting a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics indicate an attempt to redirect users to potentially harmful websites.

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/123?keyword=azize+gurdjieff+pdf
    • https://novafexoxola.weebly.com/uploads/1/3/4/4/134400343/relasolin.pdf
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f89c7e9e1e08.pdf
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f9bb735e3b1c.pdf
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f90ee15b9f22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1ab0a15-f70a-4ce4-9e51-443868ebc300/zafudoge.pdf
    • https://uploads.strikinglycdn.com/files/813d1cd2-a21e-4e15-b0ad-cd655099c143/68632709494.pdf
    • https://uploads.strikinglycdn.com/files/2757b151-242e-42a8-b7db-4c156cd3d849/28518184759.pdf
    • https://uploads.strikinglycdn.com/files/ae007805-1422-4260-be33-96a12514e193/jelomopigotek.pdf
    • https://uploads.strikinglycdn.com/files/b028126d-68c3-4f12-9e61-cc3b14b7cffe/dogagijakodevu.pdf
    • https://uploads.strikinglycdn.com/files/d6e19acc-ebb5-4e54-a6ad-9f9c13d9a7f6/vuvilamofuwexenom.pdf
    • https://s3.amazonaws.com/susopuzupure/liremisoniritanamav.pdf
    • https://s3.amazonaws.com/wilugugo/wetuseje.pdf
    • https://uploads.strikinglycdn.com/files/27ffee28-4bd0-422c-91a7-6d7e3c56a3a1/harry_potter_emoji.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_off0000ce60.bin
c6812fe1e2c6423c895dbf0ce721bdbe94c88945a8ea32071c2ad7164116d7f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 4904 bytes
font_01_sfnt_off0000df36.bin
910b664acca68c29554719ddb3c22b456d662a86aec54340aeb122a672cbd966
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 9792 bytes