Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b162c644bbe5c…

MALICIOUS

PDF

93.2 KB Created: 2021-01-30 21:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8f277dfc1459ea6200673ccb4ccbfbb8 SHA-1: 530332563f8310f9b1b44263be369a3622f1dd54 SHA-256: 549b162c644bbe5cd3e9301326745647df869a43f38770cbf39e42531453abcb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically pointing to a movie download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

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://seumenha.ru/123?utm_term=stree+movie+online+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449205/normal_5fdc3fd19153c.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/gorisoromoveviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_5fd3c14e2a2da.pdfIn PDF document text
    • https://rulipowijipej.weebly.com/uploads/1/3/0/7/130775545/jigakamizoz.pdfIn PDF document text
    • http://osthondroz.com/naxetovukulojb41ea.pdfIn PDF document text
    • https://cdn.sqhk.co/koroxofusino/3ifNjhC/92235211041.pdfIn PDF document text
    • http://stavki.link/medieval_europe_battle_tacticstdhzb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370555/normal_5fec2feb0183d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://firuwasuwubo.epizy.com/80686367190.pdfIn PDF document text
    • http://vepilezora.epizy.com/consumer_reports_best_infant_car_seats.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/interview_in_english_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lazesej/apply_patch_using_android_studio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 4836 bytes
SHA-256: 1965d3790dc635d5c08b589bc761b933da82983299a66512609cc5e5638ec7bd
font_01_sfnt_off000133e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E5 11144 bytes
SHA-256: 82482ab50aec81c3711a492ecc57d7151998fc81bad1ad155dc4bb439cc64342
font_02_sfnt_off000159a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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