Malicious PDF — malware analysis report

Static analysis result for SHA-256 093683e54c042a7f…

MALICIOUS

PDF

80.9 KB Created: 2021-02-26 12:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3d6b544478e75960b157e42db422f556 SHA-1: 9d66c0bf41b03fd1d6624ff31ebf69ee89baa797 SHA-256: 093683e54c042a7fda16ef667d04f4175e18c2ee62c24e625c19cdf81808f565
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, with a primary suspicious URL being https://nipisod.ru/strik. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=marlin+336c+scoped+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389104/normal_6011409c3e450.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/85010473398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ff88719b5c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_601494e7855e9.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/novewipogam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450418/normal_5fe1a97bb7eb4.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/can_i_convert_to_jpg_for_free.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/lerosogi.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/how_to_fix_proform_elliptical.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_60265e97f2d79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doroxokile.epizy.com/arithmetic_worksheets_grade_5.pdfIn PDF document text
    • http://kudugumokob.epizy.com/simple_file_example.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/what_do_you_call_a_person_without_a_conscience.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/reebok_club_c_cardi_b_womens.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_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 5540 bytes
SHA-256: 87164b7f2cfab27e28da0dcc80216161ded672b962c089d96f7f1402bf869115
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 11144 bytes
SHA-256: 2d9f13d0475574d7c1c2451e1a3852b49a853a5c5000fe9554a3bf5b416bd83d

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