Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f620c7fdf15e9a…

MALICIOUS

PDF

70.9 KB Created: 2020-11-25 03:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f27664b63274db8367368c55a5b32a50 SHA-1: 78ddd2e6fae4a7f70a595b2d7dbfb68ae3a75b02 SHA-256: f2f620c7fdf15e9a7a36f948e66c84f1a87b5d2f2955c957b92604ee0addc681
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, https://trafftec.ru/strik?utm_term=snugpak+jungle+bag+winter, suggests a potential lure related to product sales, which is often used in phishing campaigns. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=snugpak+jungle+bag+winter
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/8f4b4e8d1a.pdf
    • https://cdn-cms.f-static.net/uploads/4500447/normal_5fad342a90c23.pdf
    • https://cdn-cms.f-static.net/uploads/4418381/normal_5fb40c6ddeceb.pdf
    • https://cdn-cms.f-static.net/uploads/4473041/normal_5fab5be1ea4b4.pdf
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f9e0191e369d.pdf
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/5762396.pdf
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5f9e555b95aa3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mupukesunobaga/wosipikipubuwazodizox.pdf
    • https://uploads.strikinglycdn.com/files/cb8ded7d-d21d-4226-b856-3315eb3ea7af/mowefelopotugunekerepuzuz.pdf
    • https://uploads.strikinglycdn.com/files/68ead078-e487-4258-b22e-3e7ce5a86c9f/jezewatolaxubosuvosi.pdf
    • https://s3.amazonaws.com/ladojenefe/cross_reference_fram_to_wix.pdf
    • https://uploads.strikinglycdn.com/files/421ea7c6-2864-4212-b874-8ea4d667f30c/95151949600.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_off0000d8cb.bin
ea8d2697072beb3134a4031ee7ecab92dcf65270e6f6a9e140bcb7e439710b78
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 5284 bytes
font_01_sfnt_off0000eaec.bin
718209e6a56fa7bae17b3bee56378929b0b6d7990f48f98ad140765e542f0d45
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 10524 bytes