Malicious PDF — malware analysis report

Static analysis result for SHA-256 772e6549be7d4eab…

MALICIOUS

PDF

71.3 KB Created: 2021-02-21 21:12:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 063396877c467a6cedeebc19dacbee28 SHA-1: 329226cf795b26ded9b087644184a0e64dbf144f SHA-256: 772e6549be7d4eab38be8bcbfb85d0d4ea2300063a4bb7955e0520ccda146bd4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to distribute further payloads or collect user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wb?keyword=webasto%20heater%20codes PDF link annotation
    • http://ing-jobs-opportunities.com/goredunesulicem7m.pdfIn PDF document text
    • http://oneitshop.info/895505078335kgzr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_600e69b9eee6d.pdfIn PDF document text
    • http://physcoo.com/calendar_2020_vector_freeggttu.pdfIn PDF document text
    • http://tranquils.space/59089778233i4lka.pdfIn PDF document text
    • http://doucheapp.xyz/4_piece_heart_puzzle_template31b27.pdfIn PDF document text
    • http://dragonflysagewellness.com/hardest_game_in_the_world_3rex4j.pdfIn PDF document text
    • http://gufutaca1.xyz/wedding_day_wishes_images_free9fod7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390330/normal_5fdd90f795464.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/dMjfQ1U/home_electrical_installation_guide.pdfIn PDF document text
    • http://slmit.space/eclipse_helios_installation_guidez2ot7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494668/normal_5fd6489b806e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_5fdc7ee71c8ef.pdfIn PDF document text
    • https://cdn.sqhk.co/keximovib/hXicXcA/affinity_photo_clone_tool_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413239/normal_600eba8e14da0.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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 5148 bytes
SHA-256: 5607a80924070659af87c7d2d8a59894a52b335e7b23f717dfc825fb097b872e
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 10524 bytes
SHA-256: e0985eb32a1718420e01b1d67de4695785a5c5cffe624fac726aefbb0b1c34ff

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