Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a36ea07fca488dc…

MALICIOUS

PDF

74.2 KB Created: 2020-11-26 14:17:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 501de3082cff7e4737b697d2e0ff119d SHA-1: 1de53ced04961f436353e190cda8e3de0e4f7ca7 SHA-256: 4a36ea07fca488dc4030d3daedd628724d44b276566028c0006a3dfb1496a9d8
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, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing page or a second-stage payload.

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://cctraff.ru/123?utm_term=vertical+angles+and+linear+pairs+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f9937a72e3e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_5fb525a0d011a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f91f7bd51457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5fad916af2de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_5fa8f89339ce2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/syntel_technical_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a139c2df-d856-4b2b-8043-e6517a45cfb5/41417996071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5b4901-04c1-44c6-b048-06e936de313d/pavitamezarok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba194fb6-65f2-4209-ae77-011dc631ce98/u_haul_tow_dolly_rentals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333ca43f-6d2f-4c77-9850-bc352744f9a7/46055277349.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/giwereladukaxeremabakuz.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 5456 bytes
SHA-256: faea55469f95435dac9ab2d54fce4c52db1f6d3f483b3a75560217b4eed7fd9a
font_01_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 10968 bytes
SHA-256: c9f9a00d84809ddb07a596e06a3925e6a14be48eefd07146ab90adb145101c08
font_02_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 16072 bytes
SHA-256: 3da9309f7c28e01a20d15285b754fad9116e6eb7744d168a0fff2950d6122081

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