Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1e3fe2f10d1a3f…

MALICIOUS

PDF

73.0 KB Created: 2021-03-28 22:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: aaf46658e9d30ea8e8278c826f2d954a SHA-1: 039df13f7d87045f771597b140e1b13080273ac7 SHA-256: 8e1e3fe2f10d1a3fb54698127b40694a1056af282059966d8ec81acd4c9ddb29
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://kuzutuzo.ru/award?keyword=adjective+prefixes+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5ff1384213dd3.pdfIn PDF document text
    • https://vipopatovosidop.weebly.com/uploads/1/3/0/7/130775456/1977774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_605ae3e010b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_6046f9206daad.pdfIn PDF document text
    • http://mitefakosutupot.22web.org/76322433733.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/kabipitorofol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5ff133c24cda5.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/eehfhjK/retro_racing_game_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/defegitip/jjehdV7/28075401182.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/zibhbOW/counter_terrorists_win.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_6012c5e403825.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/tezinunojixodo.pdfIn PDF document text
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/a03b874.pdfIn PDF document text
    • http://xolorodabo.22web.org/ketazar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapizifotokom.epizy.com/4548492814.pdfIn PDF document text
    • http://jexusapije.epizy.com/49341955943.pdfIn PDF document text
    • http://wusojomirewo.epizy.com/99049529082.pdfIn PDF document text
    • http://roripufunubome.rf.gd/suntrust_investment_services_address.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_2335573ecd664d31afd488961fd0ff53.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_b14bc423d03f483192ee4df705d28c4b.pdf?index=trueIn PDF document text
    • http://xafazox.rf.gd/bcs_question_bank_with_solution_mobile_version.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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 5352 bytes
SHA-256: 12cc01ea2c6de603cab73c23a3c1c650ebd1f74e997d43a33b8cd2d46b7d8ad3
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 10512 bytes
SHA-256: fc063d4f916e7788ac8ebf9a1306d65e1ab9a84cf9029f93dc3770216f0c463b

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