Malicious PDF — malware analysis report

Static analysis result for SHA-256 b931b31ea28963e0…

MALICIOUS

PDF

70.3 KB Created: 2020-11-18 21:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9e02020e75cc0a82e25f5753ffb5a59f SHA-1: 678c700cedc870ac3ac925cb00ace9b946ab0202 SHA-256: b931b31ea28963e0ac8b496af19f19de68270ed2f014cf70a97f20dceddc5ad8
244 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, functioning as a link farm. One of the embedded URLs, `https://traffking.ru/strik?utm_term=readers+choice+5th+edition`, is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffking.ru/strik?utm_term=readers+choice+5th+edition In PDF document text
    • https://vutizimowunofe.weebly.com/uploads/1/3/4/3/134354130/bibinadoli-wegufofig-motafos.pdfIn PDF document text
    • https://zawivipesanupi.weebly.com/uploads/1/3/4/7/134724715/marunejokinej_totagilopefego.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/025e676f6.pdfIn PDF document text
    • https://dokipodaj.weebly.com/uploads/1/3/4/3/134306773/4501298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_5faa867e75772.pdfIn PDF document text
    • https://mawoluji.weebly.com/uploads/1/3/4/2/134265904/ac761bf9542e.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/gutoxoxe_karunomiviwo.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/8944712.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0bf6b9-47eb-4568-993f-8136612b6e0d/23622472816.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/maxakesulus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d97124-9318-450e-b3c8-24a43b1198f9/linimix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716d53f2-5063-4ab1-8695-2fb311f5ca08/2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576e2d25-8a08-41a6-ad59-1795022b2ffa/78558422238.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 5124 bytes
SHA-256: c907f4c2dd1de64fc54e05bf13706e4c78a2294e2da2cda80b48bf79e32b6d63
font_01_sfnt_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 12472 bytes
SHA-256: 35b84fd0a1d137b3848872951ef7f991e7447538ab8cd5b9865cc7fc9415b3e7

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