Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d44725f87bb7c0…

MALICIOUS

PDF

67.9 KB Created: 2021-02-12 18:56:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8e8b411ebe22a6f24e0945fff61560d6 SHA-1: b647ff9a5ccc391cb0bf4372c2fca8fe9e91ee36 SHA-256: 28d44725f87bb7c09ab3c293fe0627c90922c7f0d601ee318bb6f5e936c9ad1d
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The primary URL, 'https://seumenha.ru/123?utm_term=adobe+premiere+pro+2019+crack+reddit', indicates a lure related to cracked software.

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://seumenha.ru/123?utm_term=adobe+premiere+pro+2019+crack+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407102/normal_60251d15e0dba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458827/normal_5fde2593e6995.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/gha0Ugd/arena_theatre_events_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5ff5a312a7358.pdfIn PDF document text
    • http://jubevejazuten.iblogger.org/38075275973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412996/normal_60070bdf2e898.pdfIn PDF document text
    • http://pesavobedevas.22web.org/jyoupro_fitness_tracker_manual.pdfIn PDF document text
    • http://daxosivonoz.iblogger.org/stages_of_language_acquisition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dugexirawotuv.rf.gd/bebisez.pdfIn PDF document text
    • http://lapojuvide.epizy.com/14841644675.pdfIn PDF document text
    • http://puzuzebud.epizy.com/best_watermark_software.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/15065924127.pdfIn PDF document text
    • http://funizenobuwuka.epizy.com/free_html_template_for_event_management_website.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/game_zombie_catchers_mod_apk_revdl.pdfIn PDF document text
    • http://bamusob.rf.gd/jebidawikitikewuw.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/hp_elitebook_840_g6_spec_sheet.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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 5684 bytes
SHA-256: f1d3fea75daeac3b40296ede5e985e84d6016bb545562bae61886d13b6523fe1
font_01_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 11052 bytes
SHA-256: 8b184327310cda0fb0953be1b83ce569feae85ef3766b96f9aa5d730873f1cfe

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