Malicious PDF — malware analysis report

Static analysis result for SHA-256 458a7b644d17975f…

MALICIOUS

PDF

72.6 KB Created: 2021-03-23 19:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01c64a65a303bd3bb8b18fab4bc9a412 SHA-1: ec72d698972da5f9812ee36e3e2d2173c935cd6f SHA-256: 458a7b644d17975faeeda67b1dfab52eef5cdd69a51129013b95d56e837f77da
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

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://jumiwimov.ru/123?utm_term=volare+gipsy+kings
    • http://jidapuxedepu.medianewsonline.com/module_8_basic_aerodynamics_questions.pdf
    • https://cdn-cms.f-static.net/uploads/4471455/normal_6053b946ab85c.pdf
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fe2847e166ce.pdf
    • https://cdn-cms.f-static.net/uploads/4407299/normal_600def04664cd.pdf
    • https://lenagalazipanom.weebly.com/uploads/1/3/5/3/135310064/neporoval-lopilolitejegez-pivanunad-jawam.pdf
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/toxakozonivinurabuxu.pdf
    • http://kizisuruz.22web.org/phet_balancing_chemical_equations_html5_answer_key.pdf
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/tezuf.pdf
    • https://ninalekenapuboz.weebly.com/uploads/1/3/4/0/134017067/guxofusizufatow.pdf
    • https://lepenenaxagonu.weebly.com/uploads/1/3/0/7/130739126/39e87c0d72b1284.pdf
    • https://joxureduragup.weebly.com/uploads/1/3/0/8/130874613/zivijoxute_towiruworodog.pdf
    • https://zataxusesuta.weebly.com/uploads/1/3/4/3/134311667/juvir_mesizijaxo_nurozelojim_motojewojur.pdf
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5ffd3950eb238.pdf
    • http://kigaruzolalo.mypressonline.com/frightful_s_mountain_book.pdf
    • http://tadunikij.22web.org/65335452791.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e88f0b43-cd79-4fb6-adb0-e89ed79a4ec7/tijedav.pdf
    • http://juborekif.atwebpages.com/zikutaxe.pdf
    • https://uploads.strikinglycdn.com/files/49a68237-c0b9-4830-9734-d0d63810528a/96426439117.pdf
    • https://uploads.strikinglycdn.com/files/ae580338-27b7-4a8b-9fc5-a75a68c9a316/jemirapirimobolexikobon.pdf
    • http://fazegujopazoj.atwebpages.com/grammar_practice_activities.pdf
    • http://xumerapugegivo.epizy.com/80501266080.pdf
    • http://xegiseko.epizy.com/vaguzagiboxojuwafoj.pdf
    • 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_off0000dccd.bin
d69c1156d8d4ea80a823b7faa99c766c33e34924c8aa5e2ad58dd4b3b765f5a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 5120 bytes
font_01_sfnt_off0000ee57.bin
f21a3b6c108dbce6a0696a301615bd36e5c858c3885ddbf4dd65d284ea0689b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 11912 bytes

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