Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7975d46241f6221…

MALICIOUS

PDF

76.1 KB Created: 2021-02-24 02:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6fa283d74beaaffd444c47918ca3fc30 SHA-1: bbec9af2242edacb2b32a61f959c2194b1f36737 SHA-256: a7975d46241f6221db24b69070ba540fa0001d9e4de722e30b49b36431bffba9
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, characteristic of a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=ala+mhigo+guide+deutsch PDF link annotation
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/rotimoruveluba_zanunoj_gafesotamubej_vojojemejin.pdfIn PDF document text
    • https://sobolone.weebly.com/uploads/1/3/0/7/130775045/1408295.pdfIn PDF document text
    • https://cdn.sqhk.co/juzivadareka/0miXi2O/where_does_dominoes_game_originated_from.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470224/normal_5fc69cc383154.pdfIn PDF document text
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/f7cfcf98.pdfIn PDF document text
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/4039775.pdfIn PDF document text
    • https://jewafime.weebly.com/uploads/1/3/2/6/132681773/3943145.pdfIn PDF document text
    • http://tuvawom.iblogger.org/singular_and_plural_forms_of_nouns_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevonaku.rf.gd/godawizefojevabov.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/22273630936.pdfIn PDF document text
    • http://numekup.epizy.com/abominable_full_hd_movie.pdfIn PDF document text
    • http://bonizeza.epizy.com/curse_of_strahd_maps_for_players.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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 5248 bytes
SHA-256: 369aae4f05722aac6018cfba7e0071f66592e9618428341caa6b2d403fa318f2
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 10720 bytes
SHA-256: ee84313dd52d9119fc2254d9eba5483d6c19ef2ccb3d36aa0e8f5f2fc93b7206

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