Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d81535012d646c…

MALICIOUS

PDF

89.8 KB Created: 2021-03-16 22:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c9d7c823c09287d8a37f92827f4f13a8 SHA-1: 208fe58d38be02177f73942eb6e1ca421722508e SHA-256: d5d81535012d646cd7e353a6cb0ae0752e7c344933e1f0b6efabac1950eee229
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with at least one, 'https://dugedepap.ru/wix?keyword=living+the+martial+way+forrest+e+morgan+pdf', being of unknown reputation and potentially leading to phishing or malware. The heuristic 'PDF_SEO_LINK_FARM' further supports this, indicating the PDF's purpose is to generate traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/wix?keyword=living+the+martial+way+forrest+e+morgan+pdf PDF link annotation
    • https://cdn.sqhk.co/jugomuzuteb/aThfhhs/snake_island_flagpole_sea_of_thieves.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/20774575870zjxvq.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/geaFzX8/jotibexus.pdfIn PDF document text
    • http://uablog.site/nofaxosamaverezt4grd.pdfIn PDF document text
    • http://kraftmann.su/apush_period_1_guided_notes_answersuymu2.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/ji2wggV/wozukoja.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/VgchegF/learning_spanish_in_spain_summer.pdfIn PDF document text
    • https://cdn.sqhk.co/lugenaru/gpjP7ib/income_tax_e_filing_user_guide.pdfIn PDF document text
    • http://fruitslope.online/kenwood_tm-v7a_microphone7rj6o.pdfIn PDF document text
    • http://magazinrf.xyz/tamunukigebaxinedl8yc7.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/gjbhcgi/alter_ego_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/robimovule/PNpgevE/49939117540.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/3abfb449-612c-4719-b1af-560566b38c7a/how_to_run_python_code_in_sublime_text_3_mac.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_41e5ca0900aa4bf8adf21418ad6a1a96.pdf?index=trueIn PDF document text
    • https://8607b5f8-c2b2-49b7-a314-b17bd4efff40.filesusr.com/ugd/d99252_6bd4feba28354c39bd13cdab1d9d4cf5.pdf?index=trueIn PDF document text
    • http://bizujexexo.epizy.com/53119477088.pdfIn PDF document text
    • http://lunupesefobe.rf.gd/96807763926.pdfIn PDF document text
    • http://vulamexi.rf.gd/bow_tie_pasta_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b0f0db-8502-48ba-9cfc-1f53e7488160/16951647431.pdfIn PDF document text
    • http://kojokiguxan.epizy.com/brother_sammy_worship_mix_audio.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_dd427a198922472fb7cca74d1c2a90ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3481cd-6c4b-4f24-bd2b-947eeeff152d/naputewowodito.pdfIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_86c9f69ff47b4140861ff06a7480111b.pdf?index=trueIn 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_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 5648 bytes
SHA-256: 1b8c9a4d95cc078e1ae3e07326d7caf7ebb5e3ebd3be10a044d9577874dcd9e6
font_01_sfnt_off000132be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BE 11412 bytes
SHA-256: 31bd4a09df3db0bdae24eecbcd478742d0df517fd5dc0db117135de42d44055d