Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a459a57b378226…

MALICIOUS

PDF

78.2 KB Created: 2021-03-18 00:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e646c931e80dee8ca549379ba97858 SHA-1: 4931dd947077113845fa6b641e65c2cd9af7a74c SHA-256: b1a459a57b37822668ae747abd89d871537d7ef4998e068e3cacf1fa20be68e0
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, 'jacksth.ru'. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains references to 'Jotul 602 firebox size' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious URL for potential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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/strik?utm_term=jotul+602+firebox+size
    • https://cdn.sqhk.co/pivifilogopa/gjE8djh/super_why_power_to_read.pdf
    • http://lazirawolewok.getenjoyment.net/how_to_open_motorola_talkabout_250.pdf
    • http://pifemukopisare.sportsontheweb.net/digital_marketing_plan_template_ppt.pdf
    • http://dipunag.getenjoyment.net/adaptability_test.pdf
    • https://cdn.sqhk.co/moserusoba/jejckBV/escape_room_mystery_word_level_38.pdf
    • http://wotidoteked.mywebcommunity.org/9522384073.pdf
    • https://cdn.sqhk.co/jabuvilir/hejdjjf/us_police_car_racing_2019_free.pdf
    • https://cdn.sqhk.co/vuranataxu/jias3hg/formal_letter_asking_for_information_phrases.pdf
    • http://kigumelez.medianewsonline.com/azkar_sabah_islambook.pdf
    • http://xitawefavam.medianewsonline.com/63342548457.pdf
    • http://mibemuxagegija.mywebcommunity.org/the_mortal_instruments_series_by_cassandra_clare.pdf
    • https://cdn.sqhk.co/lilanoto/Sfefqud/best_bronze_age_comics_to_invest_in.pdf
    • http://xiruzox.mygamesonline.org/vizio_sound_bar_5.1_manual_reviews.pdf
    • http://vaxiliwu.medianewsonline.com/96405614877.pdf
    • https://cdn.sqhk.co/madilaxetevo/eRvggpA/snake_island_facts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0022a636-8a28-4953-874b-044883c35376/sunumu.pdf
    • http://lavapokapajemob.myartsonline.com/analog_and_digital_communication_systems_roden.pdf
    • https://uploads.strikinglycdn.com/files/df70b857-5d0e-4adb-9b16-28db844dc3b8/rue21_careers_age.pdf
    • http://poborunedajemo.onlinewebshop.net/garokexeperuvevozidugif.pdf
    • http://ligujizulogi.atwebpages.com/pebozapez.pdf
    • https://uploads.strikinglycdn.com/files/fe8b82b0-773d-4be5-ba9c-cc0333b0d65a/totoxikitanovimegewasolu.pdf
    • https://uploads.strikinglycdn.com/files/7f3d6530-f2e9-4e49-835f-8e12830ea8c0/xowunatitenezimiz.pdf
    • https://uploads.strikinglycdn.com/files/4a752e3b-9ebf-46a3-99fe-04ae32b3cba0/31772636476.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_off0000f102.bin
e316cf705510d3a7a193003dc05ba19f322e88653b584acbe9c90f79542cc071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 5228 bytes
font_01_sfnt_off000102ec.bin
53d080d0c81cd8f8e4b8e9d61781f576b690977d36f08233cf4a690541ca9441		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 11380 bytes

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