Malicious PDF — malware analysis report

Static analysis result for SHA-256 426429216d21d124…

MALICIOUS

PDF

60.4 KB Created: 2020-12-17 12:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 256ffcc4fff403cc5d0db927ccec56b8 SHA-1: ed5fe33730b1c8a6ec05c01d00cb64237877b6f5 SHA-256: 426429216d21d12407335d0b5f5f4319ec7f90e49ad49de461f415a1f6df5029
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/123?utm_term=civilization+v+android+apk PDF link annotation
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/regomeripo.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/2412576.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/7756668.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/xasil-pexegido.pdfIn PDF document text
    • https://mizunemaki.weebly.com/uploads/1/3/4/8/134850414/5072554.pdfIn PDF document text
    • https://fomezesas.weebly.com/uploads/1/3/4/3/134343882/nipifafigezadago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2620fb9-5b62-4418-b628-2cc9687833d8/jixasinufuveba.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/marif.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/magiwesato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec55428d-f28f-4e23-b12f-2e5e0dccedf6/tavisofemega.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/ocpjp_8_study_guide.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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 4852 bytes
SHA-256: 83a7f9912f87f5bb1f6a3571102865195bb845d9f1f30bc47c158a1880ecb977
font_01_sfnt_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 9980 bytes
SHA-256: 24fa7629676133f4ef0b0115edb962dac9933c03b1a3cb995797ead13d36b435