Malicious PDF — malware analysis report

Static analysis result for SHA-256 59594d4386a85536…

MALICIOUS

PDF

67.6 KB Created: 2021-02-02 20:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ea8f9a0c7a5ad53caaae91a29f773d84 SHA-1: a61bbee976de2ccb067d1ac15885f6c35d42a581 SHA-256: 59594d4386a85536f17eb5f1fbb6bc4c88aa89c26c5c278f7428a12a6886ab63
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a known malicious redirector. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where the user is instructed to open a password-protected archive, likely containing the actual malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://crophysi.ru/wb?keyword=ocr%20online%20converter%20pdf%20to%20excel In PDF document text
    • http://straponartist.com/paladin_character_sheet_5er9sdt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_60111f3f2cdd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_60112840333d4.pdfIn PDF document text
    • http://strita.space/58365618733dis8g.pdfIn PDF document text
    • http://repair-planshetov.ru/70459453346uf4bg.pdfIn PDF document text
    • http://artrosil.xyz/lab_safety_cartoon_worksheet_answer_keyi8t3i.pdfIn PDF document text
    • http://bestsaleshopin.xyz/5611111495jthw7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369522/normal_60025cc7d8e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_6010efba4812d.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/3pR5By4/active_college_basketball_coaches_with_most_wins.pdfIn PDF document text
    • http://opssmall.space/67939011856x0345.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_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 4916 bytes
SHA-256: 5bfb9cab8776a03025f4308b7ab5445ced55b1404a6c9c0220ab7ac5a9c28f10
font_01_sfnt_off0000db1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 11900 bytes
SHA-256: 46a45b767265e5e15c0ea5f83447a5943e70b0ad645705d666635003a90d9cda

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