Malicious PDF — malware analysis report

Static analysis result for SHA-256 32411666336af1a5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-20 00:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 033b3ad1e18999241168a4297dcc5efd SHA-1: c4c62d3968d33567f7d18ab06a069a8cd0abb226 SHA-256: 32411666336af1a5494c7fa148c41225b1915cb5914bac15f330e70d92c0a916
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to appear as salary information. The PDF structure and embedded links suggest a phishing attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=auxiliar+de+tecnologia+da+informa%25C3%25A7%25C3%25A3o+salario In PDF document text
    • http://gagimubu.mywebcommunity.org/how_much_does_a_diesel_mechanic_make_a_year_in_canada.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/position_of_adjectives_exercises_with_answers.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/will_50_shades_of_grey_be_on_netflix.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/nazipaxituwosopufesebeti.pdfIn PDF document text
    • http://terugate.mypressonline.com/2291088442.pdfIn PDF document text
    • http://nonoxutiwi.mypressonline.com/bacterial_growth_phase.pdfIn PDF document text
    • http://guvizaw.22web.org/consumer_reports_magazine_cars_2019.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/ralabobeliz.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/how_much_does_hyundai_charge_for_service.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/how_many_drills_can_you_miss_in_the_army_reserves.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/tozexowatesaje.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/rudugevujupevef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a715df55-674b-4f99-9fc7-436d52f7fcd3/buzz_lightyear_battery_powered_car.pdfIn PDF document text
    • http://xotopusedewix.myartsonline.com/alimentacion_parenteral_en_recien_nacidos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f07ccc-ff6b-4819-9b1b-8cbd8649f24b/haier_portable_air_conditioner_hprb08xcm-t.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/hp_laserjet_1012_toner_office_depot.pdfIn PDF document text
    • http://genolewedusu.myartsonline.com/anti_magic_academy_light_novel_volume_1.pdfIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/utility_function.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/roman_aqueducts_and_water_supply.pdfIn PDF document text
    • http://pevexuzuzuku.rf.gd/1998815080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f56212-d14f-4d94-9b11-3e0ea6813523/evaluative_reading_comprehension_test_for_grade_3.pdfIn PDF document text
    • http://nawixiduwataluk.epizy.com/super_mario_sunshine_walkthrough_nintendo_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e231e90-c642-4df8-ae61-927b1c8f682b/how_long_does_it_take_to_learn_fingerpicking.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_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 5900 bytes
SHA-256: aa09f2e28f25101ebff228c2c5f8bcd612d5566c94151b2d2fbba443ef83ba8a
font_01_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 12736 bytes
SHA-256: e460b0f6e66a9f508280fc5d02777ebeda93e14e3a3ec833543a5d16190aeed8