Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e834f7cb26f6cf…

MALICIOUS

PDF

87.7 KB Created: 2021-04-01 21:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2c90938cd0b37067774391319bc79063 SHA-1: 21b45a84493a8a8ebd826eb2dd85516c781fc3fc SHA-256: 94e834f7cb26f6cf830e75ba1a9cf82b1361334956cced00ab2260da33d49713
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains heuristics indicating it is a link farm and a browser installation lure, designed to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://golowaki.ru/strik?utm_term=vet+assistant+programs+near+me PDF link annotation
    • https://cdn.sqhk.co/kovezozeseg/rggBvgd/handy_candy_tomatoes.pdfIn PDF document text
    • http://punalat.22web.org/5832721383.pdfIn PDF document text
    • http://zefutuwukeras.getenjoyment.net/birds_in_ancient_egypt.pdfIn PDF document text
    • http://sevelorovuwo.66ghz.com/manjaro_linux_installation_guide.pdfIn PDF document text
    • http://foxinawolukomat.iblogger.org/69273524731.pdfIn PDF document text
    • https://jelozenodi.weebly.com/uploads/1/3/0/7/130739120/tivalarixosivef.pdfIn PDF document text
    • http://bepifawajabe.iblogger.org/how_much_does_navy_pay_per_mile.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/ALJwUhb/rpg_maker_character_creator_online.pdfIn PDF document text
    • https://jimedugevebuz.weebly.com/uploads/1/3/4/4/134437071/3675347.pdfIn PDF document text
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/336077.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/accounts_receivable_process_flow.pdfIn PDF document text
    • https://kunubixofatefif.weebly.com/uploads/1/3/4/0/134096788/xaripaju.pdfIn PDF document text
    • https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/7366867.pdfIn PDF document text
    • https://cdn.sqhk.co/gotulurowav/ihpjeYz/winovipikogukar.pdfIn PDF document text
    • https://cdn.sqhk.co/kubibosujiko/gvhikd5/fomijinotujojiwagebixubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_58030193a4e84875913de52e406b3b78.pdf?index=trueIn PDF document text
    • http://kexibuxufo.epizy.com/wikugogoxugefani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b42d561-7484-46cd-b337-3f0f0e52600f/22111746714.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/zilagikojafemiwedi.pdfIn PDF document text
    • http://karokifewugasuz.onlinewebshop.net/32437482763.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_ab5a367616c9490b812d99bdcfdcd537.pdf?index=trueIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_4bb398c2ca654c6f9e3d6ef078ad0d5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ad52b7-2a58-469c-9f7e-18ed8d8d5e31/razer_ouroboros_instructions.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_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 5072 bytes
SHA-256: 2fc73aa1fa44c35fd478e443b21c928e8e63366f3940b06522be534f94f64404
font_01_sfnt_off000129b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B9 11612 bytes
SHA-256: 3dba4dca5210e51404e98817bf22738aae7dd51ccf9222a7e7b1eb7857715779

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