Malicious PDF — malware analysis report

Static analysis result for SHA-256 237761dedfe13955…

MALICIOUS

PDF

71.2 KB Created: 2021-04-03 18:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94f8df75aaa476a51d2001f4e6149d4e SHA-1: 86abd90e4393c34a7c52f2ca6bf5d67ebeb03e22 SHA-256: 237761dedfe139551b901d9c8bbf9b9b3c9eb5cffad7acbfb5360233b9c76a1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a link farm designed to host malicious PDFs. One prominent URL, 'https://jacksth.ru/award?keyword=telecharger+bescherelle+grammaire+pdf+gratuit', is presented in a way that suggests a search result, aiming to trick users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://jacksth.ru/award?keyword=telecharger+bescherelle+grammaire+pdf+gratuit
    • http://cashtanks.fun/how_to_make_a_ribbon_for_a_gift_basketf0qoj.pdf
    • https://xapebetilozeze.weebly.com/uploads/1/3/0/8/130873864/tebivonaliv.pdf
    • http://mugedly.xyz/recovering_from_emotionally_immature_parents_downloads1yod.pdf
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/753830c3a.pdf
    • https://kaxizaro.weebly.com/uploads/1/3/5/3/135349404/09db7352e268e.pdf
    • https://fimetopim.weebly.com/uploads/1/3/4/3/134399480/joroferakowofus.pdf
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/luxugejomawa.pdf
    • http://xilenemivagola.mywebcommunity.org/71268906445.pdf
    • https://lonaxixa.weebly.com/uploads/1/3/1/4/131413275/4262919.pdf
    • https://vatikaleme.weebly.com/uploads/1/3/5/3/135386674/6648274.pdf
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/momeped.pdf
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/tijufeleros.pdf
    • http://nituzovido.getenjoyment.net/simple_past_tense_exercise.pdf
    • http://nuveclovet.xyz/turning_16_advantagesrk9ty.pdf
    • http://sarupunojupud.sportsontheweb.net/arbitration_and_conciliation_act_1996_latest.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://guriseb.myartsonline.com/different_types_of_discourse_analysis.pdf
    • http://xakazasaravi.onlinewebshop.net/jadezejuxemof.pdf
    • http://nejesezape.myartsonline.com/white_tiger_2012_movie_review.pdf
    • http://votixeju.onlinewebshop.net/cables_used_in_networking.pdf
    • https://uploads.strikinglycdn.com/files/3e7e01bc-0763-488e-adaa-f3ed58865564/28156770441.pdf
    • https://uploads.strikinglycdn.com/files/985464e1-9eeb-4b0f-a185-13a019444087/24322149941.pdf
    • http://gumusimigogasuz.onlinewebshop.net/xelekegutekesaluwoz.pdf
    • https://uploads.strikinglycdn.com/files/05e8e4cb-beff-40c8-8d2f-1a90750eeba7/nubafe.pdf
    • http://lofunadex.myartsonline.com/zororutanuzegodalalawevo.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_off0000d599.bin
11d3f73d94ad97cc03053d71cb6ff6ab5aa4980384d62ee4669563446ac0ae31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 5660 bytes
font_01_sfnt_off0000e89e.bin
6b965e28fc45ed4d4a0efcd24a743c46ce0043063787c086fa4c7cc73a2fc28d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 11968 bytes

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