Malicious PDF — malware analysis report

Static analysis result for SHA-256 5853d166fd338a0f…

MALICIOUS

PDF

101.0 KB Created: 2020-11-25 05:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30edce81b0872c728509795301ba15f7 SHA-1: 7a19ccf3cedfadecf578093aca29c7f67f837e46 SHA-256: 5853d166fd338a0fe7907516c30cfa538cccd79749fb7940c679fcfb3abcdf43
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, indicating a link farm or SEO spamming technique. One of the primary external links is to 'traffset.ru/strik', suggesting a potential traffic redirection or phishing attempt. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://traffset.ru/strik?utm_term=eternal+lands+quests
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fa0c5c4d2750.pdf
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/vanusub.pdf
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5fa80b8c01365.pdf
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/417485.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/69a06c8736.pdf
    • https://vugijivanapuxa.weebly.com/uploads/1/3/4/7/134742443/9107469.pdf
    • https://cdn-cms.f-static.net/uploads/4393197/normal_5f9b3e0956bcd.pdf
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/bbad4105356359.pdf
    • https://cdn-cms.f-static.net/uploads/4381528/normal_5f8efb645f6df.pdf
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/pusepumofu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/77968a18-f26f-4801-b0dd-39fb4c6fbe1a/ios_10_cydia_alternative.pdf
    • https://uploads.strikinglycdn.com/files/5ab69a3d-7ebc-4624-ba53-03887a90863f/ejercicios_silaba_tonica_y_atona_5_primaria.pdf
    • https://uploads.strikinglycdn.com/files/365c63f7-4b79-470d-976c-04261564f9e2/roxakafimobufivavubuz.pdf
    • https://uploads.strikinglycdn.com/files/85a06792-1942-4487-85f7-c43b852cb50d/75061042065.pdf
    • https://uploads.strikinglycdn.com/files/bc38f5a5-42d9-4b0b-a4f8-565acab19ee9/62329019528.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_off00014fcf.bin
551731466a045e2bf8859f14fb3bc928a3f672a45016dc85ceaa7e01460ab5cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCF 4904 bytes
font_01_sfnt_off00016081.bin
28a32187f930ec36a15e4f1429e4fea876dafa27c4c8f3240f155b3b96073bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16081 11512 bytes

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