Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4034f0d8cd1190…

MALICIOUS

PDF

73.6 KB Created: 2021-06-12 21:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26987003143bc6cb5cab0f27ceea9a18 SHA-1: ed550af4b2c56e671f16d935fa4214e4bd963259 SHA-256: 7a4034f0d8cd119053102edf96dcff5c1d55e99742b1bc6fd7f7d7b6b3362dfc
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 ClamAV as Pdf.Phishing.Trojan and a machine learning model assigned a high probability of maliciousness. It contains numerous embedded URLs, with one pointing to 'medvor.ru', suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to external, potentially malicious, resources.

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://medvor.ru/pbw?utm_term=passive+voice+exercises+present PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424025/normal_5fd992b4cc92d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_5ff044d8c18c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_60552b8156628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakebimutep.pbworks.com/f/substrate_synonyms_and_antonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce377079-16ae-466f-8211-41be10900755/under_the_dome_book_review_reddit.pdfIn PDF document text
    • http://jazonewu.pbworks.com/w/file/fetch/144734817/resijud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0d75d1-9583-4f88-bf3b-acba1db0f7f4/how_to_fix_soundbar_to_wall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25534a94-7efe-4c60-8bc9-06638888f0f5/46987581777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd8409da-b0e0-47d1-b982-1d6393d14d57/jumidabofadafilopivetat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8963e423-2636-42bf-b1b0-46b8967d2a9d/how_soon_is_too_soon_to_fall_in_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28afd782-5cc8-4145-9f67-42e1a523c623/49112883314.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144425475/22961772592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f353354-78f2-489c-85b0-b18dbf0ecf48/66861368602.pdfIn PDF document text
    • http://kunozulig.pbworks.com/f/compass_incident_reporting.pdfIn PDF document text
    • http://zixawedeg.pbworks.com/f/2346860431.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/jezixadukufowedegogamuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c67865-03f7-4d52-806e-cc6f7b407c84/highest_rated_electric_fireplace_insert.pdfIn PDF document text
    • http://jabevexizoj.pbworks.com/w/file/fetch/144892110/asepsia_y_antisepsia_unam.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/jinabawarobofo.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_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 5024 bytes
SHA-256: c52c248f557d76d0ab986409b33eaae244671a29a58a639fbba22ee3f00d73e1
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 11136 bytes
SHA-256: 468c901478baad9925defe4c664865bfe80ce862bbcb18e5e29dad36d831d7f3

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