Malicious PDF — malware analysis report

Static analysis result for SHA-256 0890647f602e5161…

MALICIOUS

PDF

89.3 KB Created: 2020-12-26 10:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a52f136eea58a4e3abc48bd6ad1238b SHA-1: 5c716c08734a3f81eaad12566a2a0806d19f5b22 SHA-256: 0890647f602e5161f59ed3595146ae4c3ed09aadeb4f2b3b4023e951c135600c
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=empire+millennium+wars+hack
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/pogilidivimesexaded.pdf
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/3756867.pdf
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/lupodeb.pdf
    • https://gimexewevojux.weebly.com/uploads/1/3/4/5/134523505/0c9dd85dbcd.pdf
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/71772.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdf
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/zozusomonujibod.pdf
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/db58a37a10.pdf
    • https://tabodixab.weebly.com/uploads/1/3/4/5/134585887/fatawujak.pdf
    • https://waratuzinasu.weebly.com/uploads/1/3/4/7/134719343/sitatupujuxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/57b8d200-dccd-4452-9c97-1a6b849f0759/xewoduxa.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_off0001223d.bin
7b10a9ef73769e5cbac04ca4f00a17f36b4208f81c03e0088e16b5ed3fb0e634		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 5288 bytes
font_01_sfnt_off00013419.bin
785ac1eed3b32d0c4ad75e75e3b448345c58cf640c3d4289fc1abd7d51891675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 10764 bytes

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