Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0354e743581609…

MALICIOUS

PDF

78.0 KB Created: 2021-02-27 08:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 91a153c0bae1eb426e496c0d442c6427 SHA-1: 92492eece6f17be7515de1333843d9e8d15a3b04 SHA-256: fd0354e7435816095e973e05e6e7712267baf1fae5aeb66191fed12eab845efc
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://dafemum.ru/aws?utm_term=kenwood+ddx418bt+user+manual'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation, suggesting the content itself is not user-facing but rather a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=kenwood+ddx418bt+user+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5ff58ef1304fb.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/jdNiajF/55094327859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426085/normal_5fe268f6a8991.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/bipusisonaraloregepudi.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/the_possibility_of_evil_study_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/bJhejjf/vulofenede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_6015f52365b1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/50131352674.pdfIn PDF document text
    • http://fonunegemo.epizy.com/dumezap.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/guitar_mastery_method_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/descriptive_writing_book_adda247.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/62211624747.pdfIn PDF document text
    • http://getuvodiv.epizy.com/depth_of_knowledge_overview_chart.pdfIn PDF document text
    • http://jugebifa.epizy.com/wugatemirubajisiw.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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 5576 bytes
SHA-256: 330c656a1a187c90f4100e442f91ece3a410811501f136e4f3d0cda741c282ac
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 10940 bytes
SHA-256: eb5c641c5f759ed7917b77c516d049f8b63a58a7c3610ae5167bfd109d17cab9

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