Malicious PDF — malware analysis report

Static analysis result for SHA-256 986906a3040d2b57…

MALICIOUS

PDF

64.4 KB Created: 2020-11-26 03:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320defd5c96ce3d3f26bb89de5afe999 SHA-1: b9471690f382488f8a2872366c23e559ec7572c7 SHA-256: 986906a3040d2b5730bd63514f0c55a4f6a0d1650dc6b2e6dcfd0414a4e13313
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a phishing or spam campaign. The primary malicious URL identified is traffnew.ru.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/strik?utm_term=zg+survival+cheats+android
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f95e9ce8a4c2.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/sutogud.pdf
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/15bb762e86b.pdf
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fb92bf353709.pdf
    • https://wosivurojex.weebly.com/uploads/1/3/4/7/134732329/likugenagopeku.pdf
    • https://rubisese.weebly.com/uploads/1/3/4/5/134589844/bejunobu-sagon-jonir.pdf
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/b6b7af3aba1.pdf
    • https://cdn-cms.f-static.net/uploads/4426556/normal_5fb8d43cd3cdc.pdf
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/3029230.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fa0687d4e369.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a044e98d-0e3d-4130-a5ac-1f2b1b6c44f3/66196710566.pdf
    • https://uploads.strikinglycdn.com/files/b668c1d7-ad02-4801-879c-5828c844f905/dorisobepaxol.pdf
    • https://uploads.strikinglycdn.com/files/ca3e3ab6-0b94-4d7b-b9dc-edd542e93440/juvawumanukexok.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_off0000c17c.bin
fa224c6f3fe5527313094cce2a07e121f943b08ab03637c4ee2f903ba006f0aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xC17C 5216 bytes
font_01_sfnt_off0000d33d.bin
c71d8512b0f11223cffa945fcea052dff4195811a45c3df4d6bee455ad0680ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 9880 bytes