Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a6f7f347167b76…

MALICIOUS

PDF

64.7 KB Created: 2020-12-30 17:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 734a9f53ef769e465596b2a63905b7c4 SHA-1: d58bcfd8ac58f01d1d27caf0c61cc7edb2e201e3 SHA-256: 87a6f7f347167b76172b0e78b04fd15853d1e74db966ef19672d82d7c3a1afab
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though obfuscated, likely serves to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://trafffe.ru/strik?utm_term=braiding+shops+in+houston+texas
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/f78fe920d5b776d.pdf
    • https://dojiladise.weebly.com/uploads/1/3/1/3/131379401/guweboxuju_rasipakopojinu_toxowexowemu.pdf
    • https://pafuzoxim.weebly.com/uploads/1/3/4/5/134585506/71a94.pdf
    • https://cdn.sqhk.co/sanozusu/ggWjfhg/guvezu.pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/1cf471c3.pdf
    • https://wurefosupoz.weebly.com/uploads/1/3/4/4/134493787/ea97895b.pdf
    • https://kujuxase.weebly.com/uploads/1/3/4/5/134584075/e49dee30c019b.pdf
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/8a94c5425aa12.pdf
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5fb6a2aa02054.pdf
    • https://static.s123-cdn-static.com/uploads/4406776/normal_5fc5f6ac88640.pdf
    • https://fitarobut.weebly.com/uploads/1/3/4/6/134690469/nadat-bevovu-xinurim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eccb5942-b6f0-43de-8075-565de85a2503/dead_zed_2_game_free_download_for_pc.pdf
    • https://s3.amazonaws.com/jifedefujodu/forscan_2017_f250_spreadsheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b596.bin
e438399dbfe1a7542382b7c7b103b30dced00d691ecd5ddfae71599e3c810637		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB596 5308 bytes
font_01_sfnt_off0000c7a0.bin
8cdf2537d1ab4c05d56649fbca1eb4f14a20c39e6793f0cdf39db56f9d5d8db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 2172 bytes
font_02_sfnt_off0000d104.bin
48556cf89705e562e7c3e6f9e75b6f34969dd186a8b9dde1affb8f49a5d07eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 10780 bytes

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