Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d90edc08044b0c0…

MALICIOUS

PDF

82.6 KB Created: 2021-02-26 18:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5ef752008979f65d03329b3da86287d0 SHA-1: 3ae24389640b5bd8099c4a1c8f1e14c66e800e53 SHA-256: 7d90edc08044b0c0e79e4185d014ac3c18c5e925a8980b2b5048cc3a08b3544e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic indicate an attempt to direct users to potentially harmful websites.

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/wix?keyword=jacked+up+chevy+avalanche PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385012/normal_60046fb24b6af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446923/normal_600f81dc4ad60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_602eec99e99ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450040/normal_602f472da1db6.pdfIn PDF document text
    • https://cdn.sqhk.co/vekunego/rCCiehc/hat_tricks_sports_bar_lewisville_tx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_60214c17c0a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_603806c752251.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://lemenugedo.epizy.com/ruxelozubukogenukusaduxin.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/chiru_kannada_movie_ringtone.pdfIn PDF document text
    • http://mavoweba.epizy.com/61353775998.pdfIn PDF document text
    • http://jupuluna.epizy.com/esl_reflexive_pronouns_worksheet.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/bihar_si_mains_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/sabudituz.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_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 4744 bytes
SHA-256: c4666c792f6c98b19ac0da56431aa6e76a81e15a2ef04c72a67d5a1b23dd8260
font_01_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 11136 bytes
SHA-256: 5c1ea394bddd6a94b34702bbb9334b18635a0b6d2f99e154c7b8731a8e28fc4a
font_02_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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