Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c1d9aa67f176b5…

MALICIOUS

PDF

74.4 KB Created: 2021-04-27 10:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c9fe9eea97d5305a399f73824c057107 SHA-1: 7b43435ce2fe6c45298e2d43472472df91c83780 SHA-256: 28c1d9aa67f176b5e6daca062a8ab3c8bfa2412b14bff40995f3ccbdd210c6f1
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, with one prominent URL pointing to a suspicious domain ('ponafet.ru') and containing a 'strik' path, suggesting malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious purpose. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+clean+your+cold+air+humidifier PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468551/normal_604a845e107d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_60605ed3cb1b6.pdfIn PDF document text
    • http://reliables.ru/lerenuxisikefipujigeduly9ahq.pdfIn PDF document text
    • http://disuxixepere.22web.org/fefezesefudiz.pdfIn PDF document text
    • http://interior.estate/lajafowj9we.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_604513fc9f620.pdfIn PDF document text
    • http://lbaranaydin.com/dolphin_emulator_games_for_androidaaizk.pdfIn PDF document text
    • http://opticsystem.website/fuzelefajelafulerunok2de7i.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/tigajesamukumokebabibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_6061cc18be7d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_601368368b25c.pdfIn PDF document text
    • http://kewotij.mypressonline.com/vutejudutotajaretapidu.pdfIn PDF document text
    • http://rabusog.22web.org/waxajagiredili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5ffe2de10a639.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/50756141241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixoriwabivonol.rf.gd/moromubaduginowexazogusaw.pdfIn PDF document text
    • http://rojumaninewevu.rf.gd/sword_art_online_fatal_bullet_complete_edition_metacritic.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_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 5240 bytes
SHA-256: b4d74c4b99464c0ec94c7c8336e3e873e9c280257e3af7a15a2b3fec6e799662
font_01_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 10868 bytes
SHA-256: 816a196dfe110fe0376417bcba9ca1a04172742266765e8101f646ab46ed4f94

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