Malicious PDF — malware analysis report

Static analysis result for SHA-256 129235e5a7bd2b13…

MALICIOUS

PDF

58.2 KB Created: 2020-12-07 06:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d42443b7f7472344cd7812aeb902fb7f SHA-1: 1f5c5743942f34b4e84c720d3e2b48af69923c97 SHA-256: 129235e5a7bd2b1334775c4cf1b0b3ae40219b6a5ddf003d2faefaae59a0d6ee
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for redirector links and a link farm. The embedded links, such as 'https://gettraff.ru/123?utm_term=daily+drawing+challenge+reddit', are designed to lead users to potentially harmful websites. The presence of numerous links suggests an attempt to manipulate search engine results or distribute malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=daily+drawing+challenge+reddit
    • https://susominen.weebly.com/uploads/1/3/4/7/134714937/nogoribilozav_ledujudebel_woxipebesarem_lamumab.pdf
    • https://lejigatoni.weebly.com/uploads/1/3/1/8/131871980/7476327.pdf
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/nexujir.pdf
    • https://static.s123-cdn-static.com/uploads/4422144/normal_5fc74db5d55b7.pdf
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/nebavoreradiru.pdf
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/lagipawiwar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc13cf30a2757459be51ac1/t/5fc3d6fb4f983757205578f0/1606670076706/cub_cadet_i1046_parts_manual.pdf
    • https://uploads.strikinglycdn.com/files/8947d480-5d06-45c1-8adb-9a1025260e6c/70664998006.pdf
    • https://uploads.strikinglycdn.com/files/5a6a5476-57e5-47b9-a542-b7efe84289c7/n64_top_games.pdf
    • https://uploads.strikinglycdn.com/files/1a036b8e-c3d7-41e4-b28f-fc9b09e11b63/Lebkuchen_Frau_Lied.pdf
    • https://uploads.strikinglycdn.com/files/7468a160-8e4f-4829-a59c-0ecd9ddd0d00/rogalomitamus.pdf
    • https://uploads.strikinglycdn.com/files/43d1ed6f-6ab5-4277-9df5-d7cb601134d8/32466292659.pdf
    • https://uploads.strikinglycdn.com/files/3d40064d-a5f9-4d81-8407-6051196c785c/how_long_is_a_greatsword_5e.pdf
    • https://uploads.strikinglycdn.com/files/2ef8833f-f871-4222-8173-b9538a7092eb/nofovikamezawate.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf52deaf37e3b64613ccc/1606284589558/everstar_portable_air_conditioner_mpm2-10cr-bb6.pdf
    • https://s3.amazonaws.com/zirojopemup/925887770.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac73.bin
6562f73163d0541a01f5a648dcca63078286101ceac2389d87e0282735fe6893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC73 5216 bytes
font_01_sfnt_off0000be4c.bin
fc7aaf0ef9745b9a132261e833b412eb363c1584b0dee90e63a1e15ce0cf6b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 8664 bytes

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