Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b68f7e98297a53…

MALICIOUS

PDF

67.9 KB Created: 2020-11-17 18:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 46a865782837eafaa76b88b517f9a23f SHA-1: bb6917154a6a3d42041de0c3c28fcb2f059c0584 SHA-256: f9b68f7e98297a53a37f6cfcb69fef52d0cf89fca5e7d2a404905b3eafd09984
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=parler+en+public+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f9e41abcdbbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_5f9852763ff0c.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/lurajupamejivagetu.pdfIn PDF document text
    • https://sanaxuruvumuvuk.weebly.com/uploads/1/3/1/4/131438582/lugikejalasujugosa.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/20069.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/9928676.pdfIn PDF document text
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/9dfaf12fbefae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5f9671973a81e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5f8c13f0992d0.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/7a187234.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/7fe90ec9-c411-4031-8694-a7aa7a073475/wow_tbc_paladin_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7672c927-8aa5-47ae-ba8a-6f37467e5c11/tractor_supply_store_madera_california.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_off0000c9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E6 5112 bytes
SHA-256: da64ad48078096e954e6bb4345cc1ff00145b435787bef4ecabbfdc17801ac4d
font_01_sfnt_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 12320 bytes
SHA-256: dc5c8ad78bda9cb2aac9c98b30812cd29d565384249659e3fab209e96e688ea2

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