Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04b7be92ec4f903…

MALICIOUS

PDF

71.4 KB Created: 2021-01-14 11:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 825fb79de7db0432d1b6ca5012a8deec SHA-1: b32cfdab8a8443f9e74ad16c063db524acfb5dc4 SHA-256: f04b7be92ec4f903a428459b93ca263b2d73b4448ceccbecf420f8afcc0e3db2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and one specifically referencing a transmission fluid sale. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=manual+synchromesh+transmission+fluid+5w-30+for+sale PDF link annotation
    • https://siburiwefud.weebly.com/uploads/1/3/1/3/131381052/0555657d6ba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fa66c42a1470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fe513f04ccb7.pdfIn PDF document text
    • https://site-1178301.mozfiles.com/files/1178301/sling_blue_plus_sports_extra_channels.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/f4e6f01285099e.pdfIn PDF document text
    • https://site-1180705.mozfiles.com/files/1180705/didotirazuvivopojuxeruma.pdfIn PDF document text
    • https://site-1172011.mozfiles.com/files/1172011/frases_tumblr_de_amor_sad.pdfIn PDF document text
    • https://site-1175252.mozfiles.com/files/1175252/just_draw_game_level_42.pdfIn PDF document text
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/5e56cfd4083.pdfIn PDF document text
    • https://site-1228610.mozfiles.com/files/1228610/jaguzefuwide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470029/normal_5fa9b9bcbad59.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/hegj2jb/portal_3d_model_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_5fe7f804df9e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 5920 bytes
SHA-256: f92752afb70944cb1c09ba9fabee0179b154a30cc9bccbe47fb3d51052bbec88
font_01_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 10576 bytes
SHA-256: 6617543c9cbe492130f713ff9e34091554ad081db31aae72dc07f1ec3b76b9fb

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