Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3efe0d4b5c8691…

MALICIOUS

PDF

76.2 KB Created: 2021-03-04 04:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c381b1b3c17340633b73ada034fcae21 SHA-1: 9cd1c3cc71cc30f9a4653860b441c7cbe6f0dd55 SHA-256: dc3efe0d4b5c86911442442bf210308652dec7194fd12a29d2af2aa44b270e83
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://kuzutuzo.ru/strik?utm_term=the+dragonbone+chair+wikipedia PDF link annotation
    • http://reduslimitaly-official.website/coroner_s_inquest_reports_lancashirepgxmm.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/tozaxelo29zz.pdfIn PDF document text
    • http://homebig.space/kuweboxafimrab6i.pdfIn PDF document text
    • https://fukukajapojuj.weebly.com/uploads/1/3/2/8/132815924/3623872.pdfIn PDF document text
    • http://rixivuk.iblogger.org/lg_inverter_direct_drive_washer_top_loader_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/0jaibih/du_screen_recorder_apkpure_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/RBRkicR/wuzuvojare.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/siidMGv/sandwich_restaurants_near_me_now.pdfIn PDF document text
    • http://zanofijufitif.22web.org/calculus_purcell_10th_edition.pdfIn PDF document text
    • http://bezorujod.iblogger.org/giant_monster_movies_2021.pdfIn PDF document text
    • http://astropsychology.site/the_shining_1980_cast_twinsyu2lo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kigiviga.rf.gd/72601718255.pdfIn PDF document text
    • http://tuvilijemuze.epizy.com/95739158674.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/33746133736.pdfIn PDF document text
    • http://luredavum.epizy.com/pokmon_soul_silver_walkthrough_serebii.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/thesis_oral_defense_questions_and_answers.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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 5372 bytes
SHA-256: 5ece41bb9b0a774176127270a33a394136929fcf00ce7ff31c3b5f9d9e8978c5
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 11068 bytes
SHA-256: cc4e3449055fb70971646674b85ffb08e57081bbde13aff9415bb99be43242d6

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