Malicious PDF — malware analysis report

Static analysis result for SHA-256 538a2f2100055a28…

MALICIOUS

PDF

70.4 KB Created: 2020-11-10 14:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4704c8ca5c76d62cc3248c925f33962e SHA-1: 5dfb1c950aff28aac27560c5a7cee6212ae7bd53 SHA-256: 538a2f2100055a280b30c8189e8995d014db54efd215503f077fbea371e2206b
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 a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of a "PDF_SEO_LINK_FARM" heuristic indicates the document likely contains numerous external links, with one prominent example being "https://trafftec.ru/strik?keyword=portfolio+management+tools+free". This suggests the document's primary purpose is to redirect users to potentially malicious or spam-related websites, fitting a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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?keyword=portfolio+management+tools+free
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f892743c4e79.pdf
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/a63c9afa27f3.pdf
    • https://roromitekavu.weebly.com/uploads/1/3/4/5/134528712/7864591.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.pdf
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fa322497c034.pdf
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f95b0019b3b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/112a2a2c-4178-495a-a388-1cdd87683d86/gozub.pdf
    • https://uploads.strikinglycdn.com/files/7e684be1-8cdf-4064-bb77-67da879a2caf/13268763115.pdf
    • https://uploads.strikinglycdn.com/files/a564da26-06cd-48bc-a24b-36f82fc613be/yu_gi_oh_gx_season_4_episode_1_english_dub.pdf
    • https://s3.amazonaws.com/sukobogixe/gedogifuru.pdf
    • https://s3.amazonaws.com/vuraradaso/zoom_meeting_codes_reddit.pdf
    • https://uploads.strikinglycdn.com/files/85132d12-b72a-44de-90f0-2c90656480c9/monofovumexewikezig.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_off0000d269.bin
c12153a3a4b7aebdb001d9d34d2e4ee054ff022d6e307841a1970e535f01e9af
pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 5088 bytes
font_01_sfnt_off0000e3a0.bin
16adaa29d027d08d8173e51d0f8588dddb2ecf1fe181daaf4160d1b6d08c4a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 11656 bytes