Malicious PDF — malware analysis report

Static analysis result for SHA-256 731876de61fcbfa6…

MALICIOUS

PDF

73.7 KB Created: 2020-11-17 04:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8318082ad35a8f3878ca20e7e9a75b0d SHA-1: d94ef56ae1bc5c664539475fc51fb71458327e5a SHA-256: 731876de61fcbfa678e692dbc25d80bc488f60082bdab24df5aebc905ebf5bf1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/123?utm_term=telefono+panasonic+kxt7730+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_5fa43d741e106.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/mawerizesisatopal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8779fbccabc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_5f9bd9bf8a3bc.pdfIn PDF document text
    • https://pulibunubof.weebly.com/uploads/1/3/4/3/134378852/830c53.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdfIn PDF document text
    • https://jumosoguwakebak.weebly.com/uploads/1/3/4/5/134588816/e01942043ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_5fa2126a1ac22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_5fb2991db8712.pdfIn PDF document text
    • https://kulilopoxi.weebly.com/uploads/1/3/4/3/134375859/d633eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daniwodug/psn_code_generator_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/west_bend_microwave_plate.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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 5532 bytes
SHA-256: b7da53e9f225d5df4e177b904e6d77e0fa8e4f4079173f3673fdf8e0e97a6e6a
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 12896 bytes
SHA-256: 4a036b1385151ff452d93216de4aa175e6251875a4513c94b1a18b54691cb17e

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