Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ecaabd387b82ce…

MALICIOUS

PDF

78.0 KB Created: 2021-04-29 10:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d6b1a6146047193526fb729aeb64389d SHA-1: 4346d2858ebc20101fcdf038602b3babeeeffc29 SHA-256: a2ecaabd387b82ce12ce36fb6bea465626ce8738fda9315934e1bee43c40bcb4
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=what+is+the+shadow+and+bone+series+about PDF link annotation
    • https://cdn.sqhk.co/ratugetaj/rEyuShd/blue_valentine_movie_parents_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_602aefc2214b5.pdfIn PDF document text
    • http://ruregere.sportsontheweb.net/83623166221.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/SgfVohT/spiderman_vs_venom_omnibus.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/pibbfL4/ivanka_trump_mother_and_father.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392868/normal_5fcba9c27bfb9.pdfIn PDF document text
    • http://gejikojaki.scienceontheweb.net/woratifufurujed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_604da5a9ee276.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/hbvOuX4/maserati_quattroporte_used.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/hJgeghg/49100285914.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/pwgghjT/68600243497.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/dIgdUBc/problem_solving_in_endodontics_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fc7e4b1cbfcc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_10a7a0e56f614f219264accef0fb99c6.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_1af76aaf70294eea89453f5df4812303.pdf?index=trueIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_43c021d97a794186a02bf7a3b23e8068.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_9b3cda65af3c43be82e5b135bf90e644.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_dca3d612711e4caabbd9e68279a2e220.pdf?index=trueIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_25e85a8928cb4b30bd089be4f558638c.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 5124 bytes
SHA-256: aa6e6ce0da89cc6ba30903dbb3fbb227920d510d4ea9f30a175bbb39f6b5fe23
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 1648 bytes
SHA-256: b3bf58635a6616fd2d8175ab3fbe708eb5bfca77e3127467f16db21786c1078b
font_02_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 12612 bytes
SHA-256: 4169d7b848996df9c09eb9b8118a75e1c7057348f01b104bb385f69749fab162

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