Malicious PDF — malware analysis report

Static analysis result for SHA-256 60a19777a2040655…

MALICIOUS

PDF

70.2 KB Created: 2021-03-14 07:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9ba85d4a665bce5630b5829b6034650 SHA-1: b7e3a978e31abbf228cd6a471e624c03c8348416 SHA-256: 60a19777a2040655ae02f611ad5669043ac08ff3ffbb6fa28da372d2d3140565
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. The embedded URL and the link farm structure suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=indian+history+books+in+telugu
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5feb2051bd370.pdf
    • https://cdn-cms.f-static.net/uploads/4459623/normal_603a16836a921.pdf
    • https://static.s123-cdn-static.com/uploads/4481673/normal_6004915852e0a.pdf
    • https://cdn-cms.f-static.net/uploads/4393900/normal_5fd0d4971d8f3.pdf
    • https://static.s123-cdn-static.com/uploads/4482207/normal_6003b8ef08b7a.pdf
    • http://hrushch.space/minapejr0go8.pdf
    • http://wspring.space/20446027626y7vky.pdf
    • https://cdn-cms.f-static.net/uploads/4413980/normal_60484cb1c76c5.pdf
    • http://karaulovlife.site/south_indian_food_menu_list_non_vegbhmm9.pdf
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5fd79e37e4fcc.pdf
    • https://cdn-cms.f-static.net/uploads/4443344/normal_5fd0e19ddabe6.pdf
    • https://static.s123-cdn-static.com/uploads/4424026/normal_5fdffd2b38fe5.pdf
    • http://pubguckazan.com/does_maze_die_in_lucifer_season_5uwxec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_9c7a4019d97c4efd8e8641a51e7cdfbf.pdf?index=true
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_fb3b3b3e98fc478e9bacec972d5f54fa.pdf?index=true
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_8ed1a983dc324b7cbfd2d0b4c0272e0f.pdf?index=true
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_08e58d534d5943e6af6238246f5f8941.pdf?index=true
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_71e77dca988b4ebab94612b132fe5eaf.pdf?index=true
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_23299d234e394c889daf58bcb136b12e.pdf?index=true
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_431651e6ec944cdb83b3a9af19b28d53.pdf?index=true
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_f9a5aa29a1b542d596483e30dfa22780.pdf?index=true
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_eab4119f93764b91b67afc2d0a190791.pdf?index=true
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_2dcb4e7a238c42299d81b093685fd139.pdf?index=true
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_30bf50680bcf40b6904122c4fc6f3963.pdf?index=true
    • 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_off0000d37b.bin
5eae7c0b204a46a48d1711f2ec339b3c38e9dfb454f9c0614b5255e3de38fa86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 5332 bytes
font_01_sfnt_off0000e599.bin
b7db8e0c6a3d52268518b13890abed0fdcf09b7d2c29816f00c94ba5d9affc10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 10620 bytes

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