Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91ecf187a5f8f17…

MALICIOUS

PDF

72.0 KB Created: 2021-02-13 09:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f7cd79377b7b3162f064726dd355c045 SHA-1: 37cfe1ee03cde096d1db34cdf2f0f537452b1cc1 SHA-256: f91ecf187a5f8f1724c62e7fd18239d8224e500699788a7a07540fb5ad29adca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and configured as link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to drive traffic to malicious sites.

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://baarspo.ru/123?utm_term=emax+veneers+vs+lumineers PDF link annotation
    • http://siondez.ru/345581177379bwxr.pdfIn PDF document text
    • http://rabota-plus.club/16843188933l8zp.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/hghgcie/wivobakikim.pdfIn PDF document text
    • http://thiswaytovogue.com/wapajipeworapikitiyjiw4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5ffd702955e15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5ff0e8037044d.pdfIn PDF document text
    • http://anyita.space/gobuxixuloru1lemi.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/jhcjgjM/98987707825.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/hiAHmDT/63094803474.pdfIn PDF document text
    • https://cdn.sqhk.co/pegiridireva/hbK9ii6/better_camera_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/XgfrkJJ/30005400697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wekibik/chronic_uti_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/yellow_immunization_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/veritoxuw.pdfIn PDF document text
    • http://zaxatuparogojix.epizy.com/landline_rainbow_rowell_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/media_player_classic_64_bit_free.pdfIn PDF document text
    • http://mudivakerimenog.epizy.com/free_email_bridal_shower_invitation_templates.pdfIn PDF document text
    • http://doruxujegajaso.rf.gd/fufuwifejamukoxoroxug.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 4916 bytes
SHA-256: 666358ce3358e2194282d3d4bd866cecc5b8621fea2fc897908188323f9798cb
font_01_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 10144 bytes
SHA-256: ff0fccc48bccf50ba6a877514dea8f4ee598d130a0743d7220df14c94f8bab19

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