Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a7e154dc74fa19…

MALICIOUS

PDF

83.2 KB Created: 2021-04-21 16:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2672b779e74092209407f28063f83ece SHA-1: 21bf503d10253452566d14dcdb5b122902df6232 SHA-256: 25a7e154dc74fa1956e675cad49d3a0d9c3ab22abd46662c3eef62ebe4630fd9
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though obfuscated, hints at a lure related to 'physics formulas pdf class 9', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=physics+formulas+pdf+class+9 PDF link annotation
    • http://dalidusiz.mywebcommunity.org/25966265890.pdfIn PDF document text
    • http://zoosalon.org/goduxusafam63u4j.pdfIn PDF document text
    • http://damvglaz2.xyz/casa_flight_duty_times8n5ae.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/cgfGl00/deathworm_ark_ragnarok_spawn.pdfIn PDF document text
    • http://grandov.pro/depulexulaneruzhubmi.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/bedizonedirudetimos.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/ejcgfii/fight_klub_multiplayer_pvp_mmos.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/approximation_questions_ibps_po_2020.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/penguin_active_reading_level_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/ih3m3vP/kobefetav.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/99171202466zo987.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/how_to_find_the_general_rule_of_a_quadratic_sequence8qug1.pdfIn PDF document text
    • http://salet.store/mibivelopogowineluwoposobgx9.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/23909808124.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/sakilapiroje.pdfIn PDF document text
    • https://zefukigu.weebly.com/uploads/1/3/4/7/134718507/koxunijarem.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/cross_aldol_condensation.pdfIn PDF document text
    • http://lofitner.buzz/80883855074kuyot.pdfIn PDF document text
    • http://raisinshq.pro/how_to_turn_off_hyundai_tucson_car_alarmcmxza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bototiluwoge.atwebpages.com/experience_certificate_sample.pdfIn PDF document text
    • http://xotopusedewix.myartsonline.com/calculus_on_manifolds_spivak_espaol.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_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 5656 bytes
SHA-256: 9917aff24aa2c2375b41dd81ee6a8b2d51b570b9387bba65091d7f85284e8904
font_01_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 11612 bytes
SHA-256: 46a4eedebff01cf2127cc2bf9cd448f7dfc988bb8f408e9ad242af5bc97bf7d4

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