Malicious PDF — malware analysis report

Static analysis result for SHA-256 44eb7be68449fc68…

MALICIOUS

PDF

74.4 KB Created: 2021-03-18 15:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 623b03bd1b3911a13d1dd732d51ceeae SHA-1: ce2ba0ebd4b5ac40e1a97e83e517327f4b01ccd9 SHA-256: 44eb7be68449fc68eb0d892232b51efe6cc620474149ea53e6bba903193bd260
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary malicious URL identified as https://kuzutuzo.ru/strik. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

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://kuzutuzo.ru/strik?utm_term=kenmore+coldspot+parts+diagram PDF link annotation
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/1491059.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/6337260.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fec33535f977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453528/normal_5ffe13621a4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fd2745d15a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_6017bfd20f23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404123/normal_603c6847f0551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zejunosafob.rf.gd/24922660876.pdfIn PDF document text
    • http://dapunujunet.epizy.com/omron_7_series_upper_arm_blood_pressure_monitor_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/29331734922.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/79465894481.pdfIn PDF document text
    • http://kukalofawofami.epizy.com/jowugalixekafum.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/89963231484.pdfIn PDF document text
    • http://jopinewo.epizy.com/experimental_vs_observational_study_worksheet.pdfIn PDF document text
    • http://marivugedada.epizy.com/sample_email_for_sending_resume.pdfIn PDF document text
    • http://muwodanodobe.rf.gd/movies_2018_hd_hollywood.pdfIn PDF document text
    • http://sitirij.rf.gd/kivonegexoferiferositex.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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 5360 bytes
SHA-256: b49a39b3e01564d2fd6dea62693920f08e2a3f8850b5fb0a0ce9a409aec8319c
font_01_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 11444 bytes
SHA-256: bddc00cb9140fa1d11ba428cacd280827bf6b50d0cd08cfc2d38b7f9bb8ffc14

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