Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d12986a2fe09e57…

MALICIOUS

PDF

77.4 KB Created: 2021-01-17 23:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ffb1ceb60ff6155bb09d94c333b016ca SHA-1: df84460c439ebcb99cfe5152586247c9f61b68e2 SHA-256: 2d12986a2fe09e57f4579bd3fd0bfcd23d80742d06ba7459888977362968b94b
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The presence of numerous links to disposable hosting domains and a specific redirector URL strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=divine+upgrade+dark+souls In PDF document text
    • https://cdn.sqhk.co/wavagowew/bsZxDjf/nepelaterinutetike.pdfIn PDF document text
    • https://cdn.sqhk.co/disovaje/GijgfoZ/18242047561.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/nuiiygc/jefaze.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/cartoon_love_pictures.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/dozup-tejejuwovil.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/9e7ad.pdfIn PDF document text
    • http://jixelaxoli.66ghz.com/zonodikiwemixusupelise.pdfIn PDF document text
    • http://xonibiz.22web.org/dworzec_pkp_bydgoszcz_gwna_informacja_telefon.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/61615650350.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/jjdhhjg/74776119150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rokuwapesu/jaipur_national_university_mba_202_assignment_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/60032466862.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/worojulanafuluxivo.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/appeal_parking_ticket_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 5052 bytes
SHA-256: 2b6b778d6c94855f309754647a561e707a7d89550ec3dbb14c1e4a65a5e75a58
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11176 bytes
SHA-256: e67590c22505b4e9ed1cf5bce1f1f18d4e648b27b4ef422fac3de017372a0e41
font_02_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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