Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d07cf34b149694…

MALICIOUS

PDF

79.8 KB Created: 2021-04-09 22:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cacba96227e91657d5829a74ae91ad65 SHA-1: 1359839387dbc04036a22dc1a2e8c5047d78ca6c SHA-256: 79d07cf34b14969445ef155596e1557aa02a24352cb4ad2826a674fcb51a659b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely serving as a lure to external malicious sites.

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://druttle.ru/strik?utm_term=what+is+double+approach+avoidance+conflict+in+psychology PDF link annotation
    • http://japebevavagufip.22web.org/77881031109.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/niigf7L/maze_runner_2_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_600bbe0de97f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_601701221f96f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_600a203fc7b2b.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/SDUgyji/the_castles_of_burgundy_board_game_review.pdfIn PDF document text
    • http://lozaratoz.iblogger.org/lord_shiva_angry_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5fd7ac4f7c21e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5fe6bf9e80de1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501791/normal_5fefd1966f01f.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/MieT9eS/knock_down_texture_repair.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezewezelatemak.epizy.com/alexander_fleming_biografia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c551acac-8b7d-43c3-a220-f57a251a06e7/nusufavapubi.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/kind_of_houses_worksheet.pdfIn PDF document text
    • http://tofezigiserix.rf.gd/oklahoma_car_bill_of_sale.pdfIn PDF document text
    • http://lobejafunogule.epizy.com/business_process_management_journal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a843b2b-61c7-4035-acaa-f32ede3e1bd9/how_to_fight_hand_to_hand_cyberpunk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1457ee3-7024-44ab-a905-f8463b47f590/3832770652.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_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 5732 bytes
SHA-256: 57f090fc0289671b908b826dd8b2a58745ba4a8a2fc6bfa1a7559e61bc61a13b
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 10792 bytes
SHA-256: 489f986c4a6bde15d41325a273dbd8e622f655a10918b797f2431fc345dd0b06

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