Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb935195ced9dae…

MALICIOUS

PDF

72.5 KB Created: 2021-01-09 10:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e80dd282ed8666765170ac2710211e7c SHA-1: 8f124e78bb9ee21e9f4846c816c900bfc2710458 SHA-256: 4bb935195ced9daeb361d4be4c59cbc01c02701180594ab33bf061906d657f79
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest it's designed to lead the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffking.ru/wb?keyword=fantasy%20premier%20league%20gameweek%2010%20captain%20tips In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefadep/voxex.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/basic_english_grammar_test_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1a0778-3b54-4960-be28-5793385ab961/52040462442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bee624-f91c-4eac-a15b-2d434bf05e01/pomavabebadojudivebab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ebbcbe-f07f-43b8-a90d-d40de6e50a1d/word_whizzle_gorilla_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/consort_medical_plc_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3759d197-42ed-41c5-b01f-dbb46f7bf592/north_idaho_physical_therapy_kroc_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ab7f2f-053a-415c-8b3f-7fece94b18aa/soft_skills_the_software_developers_life_manual_by_john_sonmez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5bfb41-4c69-489f-b22f-ac89c1d1839b/finujunezelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d85597-7647-4b14-8595-141e781bfa02/83176356111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d26cd1-b12e-4e76-bdbe-e290b201c354/sivitisigozoz.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/nigabigaxigokudajutijajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40574870-ef38-46fc-a2e6-1ed14fb045bc/skyrim_vr_supersampling.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/50912215846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bdf107-ef25-466d-819b-aba22a60e6fe/ririrodetufajovomix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf8434f-8df0-4ca9-a442-ad6fd41d653f/hobby_lobby_reopening_huntsville_al.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_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 5660 bytes
SHA-256: fcedf7f82768c3836059c2b99ed80f116ca4b235223eed2753448ea40220e26b
font_01_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 10788 bytes
SHA-256: e1305fd154d52c881af708940cc55f937a2b79b48e6d2c58fcf140be1cf46484

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