Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa7cc45d864ef28…

MALICIOUS

PDF

72.3 KB Created: 2021-01-17 01:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f29c6e8a71c211fa5762efa34f1a082f SHA-1: ba348138074a729c35e2b2ba2f7b4127ce7728db SHA-256: 2fa7cc45d864ef2830e48cb02f73e81a0062da13c4119fc996f381eb740713ca
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external URLs, with one prominent URL being https://traffnew.ru/123?utm_term=synonym+for+another+way. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack.

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
  • 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://traffnew.ru/123?utm_term=synonym+for+another+way PDF link annotation
    • https://site-1168079.mozfiles.com/files/1168079/carnage_battle_arena.pdfIn PDF document text
    • https://cdn.sqhk.co/rotogogoji/hihjMcX/freeze_diamond_watch_bands.pdfIn PDF document text
    • https://site-1177769.mozfiles.com/files/1177769/gafojirosekibagomil.pdfIn PDF document text
    • https://site-1168265.mozfiles.com/files/1168265/7855076791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470553/normal_5fb430d15527f.pdfIn PDF document text
    • https://site-1176039.mozfiles.com/files/1176039/nasipipopurifu.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/lejun_fiwizuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/jagdUia/walking_dead_season_10_finale_watch_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/biriyani_tamil_movie_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/viwukekefezitefatek.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/gunosak.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/phim_hong_kong_long_tieng_bo.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/gegaxopoxaruza.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_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 5092 bytes
SHA-256: 2c124a5f00e7eb2aec36aaa271b6e4a358560b9e7eed64003ff921559f0ebe2f
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 10660 bytes
SHA-256: dc03c2120ce1bbad7b670498ad8e97cd55a37d03c0ae6bdb90dbf77bb5e75870

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