Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04d25c40a67dc21…

MALICIOUS

PDF

71.1 KB Created: 2021-06-08 11:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fe9dd707441e7b167d2c0ea3aa191629 SHA-1: 05061a1557a83ed65e95e4e8498835f752f912d9 SHA-256: d04d25c40a67dc2109b55d8089d79d75efb85b86f0b77cd04f5e09f08ecd6c35
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's purpose is to redirect users to potentially harmful sites.

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://archism.ru/pbw?utm_term=racine+carr%25C3%25A9+de+72900 PDF link annotation
    • https://mexarufuwusa.weebly.com/uploads/1/3/4/5/134599415/misodokopu.pdfIn PDF document text
    • https://rosufira.weebly.com/uploads/1/3/1/4/131408230/f671563eea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_601d6daa52568.pdfIn PDF document text
    • https://nuvarimo.weebly.com/uploads/1/3/1/3/131378817/ladotuwata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420018/normal_6000f603e20ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_5fd2ce4436b78.pdfIn PDF document text
    • https://lubagevaruzazej.weebly.com/uploads/1/3/2/7/132712663/2165926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitilabajeko.pbworks.com/f/88657303047.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/how_to_make_homopolar_motor_car.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144421179/82912538995.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144584910/sawev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d28a30-30bd-43af-b390-52cd3d1f01c0/37669072614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917b8fa0-aa44-4a4d-8d13-8e259b5c5dda/mic_isnt_working_on_pc.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/79991636438.pdfIn PDF document text
    • http://zanikofepaj.pbworks.com/w/file/fetch/144716496/king_kong_full_movie_hd_hindi_dubbed_download.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/naruto_shippuden_ultimate_ninja_storm_4_legacy_xbox_one.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_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 5380 bytes
SHA-256: d4e90ac2c0312af6923b78aa0b6c98e57387035b11315199ca17afe49d388d0b
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 12304 bytes
SHA-256: ce019934f6e9f7e44b59056ba7a5186cdcbf44d487c2c008e41de7f7a0f9db25

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