Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9a3770e44ddaaa…

MALICIOUS

PDF

88.1 KB Created: 2021-03-05 16:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 79009bc103a151778e069d70597a0b60 SHA-1: fe171b41305756336b71ecfb11e5c606837faddc SHA-256: ac9a3770e44ddaaa04305c45a9df4af8ff9d633f93c9489c7f6c4a3d3b589fc3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to multiple PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=restaurant+manager+jobs+london+ontario PDF link annotation
    • http://tezoxefakalexo.sportsontheweb.net/puvufemivanaxavam.pdfIn PDF document text
    • http://pay-order.info/walmart_samsung_tv_black_friday_dealdeli5.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/simile_and_metaphor_worksheets_grade_5.pdfIn PDF document text
    • http://7lessons.fun/242711453599uxhp.pdfIn PDF document text
    • https://vaxurubezinijor.weebly.com/uploads/1/3/4/6/134690270/jovaxu_vezebimosizoj.pdfIn PDF document text
    • https://mazidumusud.weebly.com/uploads/1/3/4/6/134680178/rekofaxijuxikojizaki.pdfIn PDF document text
    • http://eferevole.com/kohler_shower_valve_installationaxokh.pdfIn PDF document text
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/033047c596327c7.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/mixifesozixisuva.pdfIn PDF document text
    • http://arfesopt.com/ielts_practice_test_plus_2_morgan_terry_judith_wilsonrf3ui.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujemivegelap.epizy.com/gorimorisetafulikag.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/ejercicios_de_clasificacin_de_cuentas_de_activo_y_pasivo.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/school_cafeteria_menu_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/auditing_and_assurance_services_16th.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/dreamworks_dragon_games_wild_skies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0af46b5c-dc85-4bb7-80b6-fdb49116ae3d/xbox_360_disc_tray_keeps_ejecting_itself.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/baseball_video_games_2020_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/writing_a_newspaper_report_ks2.pdfIn PDF document text
    • http://todizegi.epizy.com/80608479673.pdfIn PDF document text
    • http://maladovefo.rf.gd/frere_jacques_sheet_music_flute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adda255f-5b51-4f24-906e-35637c330d6a/where_is_the_best_place_to_buy_grass_seed.pdfIn PDF document text
    • http://xupimegoroze.epizy.com/about_us_page_design_android.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013759.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13759 17820 bytes
SHA-256: 8f40c46b2532a8dc139f2dfd8c844bc434e01f5502038a9ee0a23a104cf737fb
font_00_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 5368 bytes
SHA-256: e6e5357191345df5201cbcb3b3a75353a9ba166a15291d7b6f2a5be2a2987fa0
font_01_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 11212 bytes
SHA-256: b58e9b61bd07273a8ddcc0ddd932c72173dbd7adc27e3d99e97592e7c84b1277

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