Malicious PDF — malware analysis report

Static analysis result for SHA-256 141b6929740b405f…

MALICIOUS

PDF

66.6 KB Created: 2020-11-13 01:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf9fbeecd36544da77565bf798c06eb SHA-1: 17486a31710cd9d03b85ef9d08b1986e8615ee5d SHA-256: 141b6929740b405f9ace35865d3024d771260a7da896b1ac9a3131d2dc4f54f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, indicative of a link farm. The primary URL, https://traffking.ru/strik, suggests a traffic-generating or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

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://traffking.ru/strik?utm_term=modelo+del+abc+de+ellis
    • https://zuzufejalapo.weebly.com/uploads/1/3/4/6/134684928/kolavopesuzupag-dezilusub-rowixudogila.pdf
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f93b81ac4156.pdf
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5f992a1699efc.pdf
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/rumano_vajomed_megabozazowedos_tewowi.pdf
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/413810.pdf
    • https://cdn-cms.f-static.net/uploads/4420432/normal_5fa5bbd45ce19.pdf
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f91bd40506bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lanorolowu/nutigebibagorazi.pdf
    • https://s3.amazonaws.com/tetazino/11610459170.pdf
    • https://s3.amazonaws.com/wexukufedepim/secondary_growth_occurs_in_plants_which_have.pdf
    • https://s3.amazonaws.com/jolufozo/70234292631.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_off0000c7ed.bin
a87246afd84d3f012f17370643545ad08fe4563dd390872819c06bd63c947055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 4984 bytes
font_01_sfnt_off0000d8f8.bin
ebabaa8edcdcee90d3bad1f92e7b08cdc2162da12241f9ad56fccfc98e73be06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 10876 bytes

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