Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46e361cc3595e3f…

MALICIOUS

PDF

77.6 KB Created: 2021-01-10 02:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8db2d0d75ab73701d10edb1010077c6f SHA-1: 75c6b1bb1c4637b098afb3c8f72ca891b98aaeab SHA-256: b46e361cc3595e3fc6cf3b5601616b27393685f3e5421b43459b75eec199ff72
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, indicating a likely phishing or malware distribution attempt. The presence of embedded URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to potentially harmful content hosted on disposable domains.

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
  • 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://trafffi.ru/123?utm_term=audacity+insert+silence+at+beginning+of+track PDF link annotation
    • https://cdn.sqhk.co/purorelaz/eidvjbN/84437154720.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/djikWia/29635190311.pdfIn PDF document text
    • https://site-1168030.mozfiles.com/files/1168030/21553242475.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/4807170.pdfIn PDF document text
    • https://sifirugosiwoxam.weebly.com/uploads/1/3/1/3/131384024/judazuwoxoxisef_mipiwufumis_figifobutukino.pdfIn PDF document text
    • https://site-1175983.mozfiles.com/files/1175983/codes_roblox_super_hero_tycoon_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_5fada0983b119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489994/normal_5fc925fb866b8.pdfIn PDF document text
    • https://site-1172012.mozfiles.com/files/1172012/top_music_2020_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5fdaaa1c2cdd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8d06069fcff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 5368 bytes
SHA-256: 5d5ba32c57f0aa8e01f08fab2ef6f0b4f7654a370de284fa0bb995e29bd86a97
font_01_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 10164 bytes
SHA-256: a10d982cf9885a06dec67e08f152f7ffc2f2f6dd8aea2b0d89a2fb9f09debf5b
font_02_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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