Malicious PDF — malware analysis report

Static analysis result for SHA-256 d170b7589b499a4a…

MALICIOUS

PDF

70.0 KB Created: 2021-01-18 01:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 32b374fb5e06b08657b0e79b4d734757 SHA-1: 1e62fb9dc2dca02a1d6b913fc1ea0c70d02a71fd SHA-256: d170b7589b499a4ad4556954a6739409bc22d644e26ffe8366c4df3ae4cf3223
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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://trafffi.ru/123?utm_term=coleman+sportcat+catalytic+heater+manual PDF link annotation
    • https://cdn.sqhk.co/webuzifinuno/ehbkieH/95551236812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5f91fd9af0523.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/waves_tune_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5fca7084bf9dc.pdfIn PDF document text
    • http://talezoruvaje.iblogger.org/11631855261.pdfIn PDF document text
    • https://cdn.sqhk.co/ketadasogob/ifchi2p/zomob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f9a3985d8b5e.pdfIn PDF document text
    • https://site-1168346.mozfiles.com/files/1168346/lyrid_meteor_shower_april_2020_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_5fcd27f27c360.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/jbjjrhh/free_online_slot_tournaments_win_real_money.pdfIn PDF document text
    • https://site-1177386.mozfiles.com/files/1177386/mario_kart_tour_cheats_2020.pdfIn PDF document text
    • https://site-1185150.mozfiles.com/files/1185150/pujabubokefuditidatimol.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/o76hhje/80785641662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5f9bb0cbc8a71.pdfIn PDF document text
    • https://site-1252463.mozfiles.com/files/1252463/zawitulele.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gopudagob.epizy.com/kali_linux_2018._2_installation_guide.pdfIn PDF document text
    • http://fupuvafibip.rf.gd/counting_worksheets_for_toddlers.pdfIn PDF document text
    • http://notijopozij.epizy.com/snuggle_dryer_sheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 5180 bytes
SHA-256: 49e3b541d364084125dd8f0164e4e802f5f3771f41900af763bb6a950d7c4579
font_01_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 11184 bytes
SHA-256: 8482b89df7ffee6a0887b4534d2be5e73622656a2f805a421e0209bdcb85601a

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