Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e8ff13d87b9e77…

MALICIOUS

PDF

72.1 KB Created: 2021-05-31 22:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0da7520e4cc56f5dffe61105120625b7 SHA-1: 5060ce51672f657460b6517e07c32a78c7965231 SHA-256: 61e8ff13d87b9e773692b03b6ef1bbd1e5aa2e12cfa9f5ee5a5b02304352c4be
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'furniture catalogue template free', aligning with the malicious URL's UTM parameters.

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
  • 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.
  • 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://dafemum.ru/123?utm_term=furniture+catalogue+template+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_6035c31e7b00e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_6058cddbc7432.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495395/normal_5fc834a15662f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_602c250c90ae9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fe164831ab90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425001/riddle_worksheets_for_5th_grade.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/bleach_brave_souls_lvl_200_guide.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411483/76558110092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07edf18c-28fc-494f-abd1-02d66758d5c6/weather_lesson_plans_for_high_school_science.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423078/ruwiwo.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421977/the_art_of_multiprocessor_programming_solutions_manual.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/shopping_stores_in_schaumburg_illinois.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/98395853220.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/mckenzie_technique_for_herniated_disc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3215160-a8b5-4096-86ad-72fbf95163fc/how_to_troubleshoot_compressor.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/605134733.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_off0000de36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE36 5112 bytes
SHA-256: 1a92557237fc1df521c649435387af72e8a4e485c3129c3f3db475bb8a4f9f1c
font_01_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 10524 bytes
SHA-256: a7eedfa2193ccbe0b76de64ec4ec34dd5cf2715e1318d603e128547eb9341f43

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