Malicious PDF — malware analysis report

Static analysis result for SHA-256 736c9a2fca8efd48…

MALICIOUS

PDF

81.2 KB Created: 2021-03-27 17:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01817596c1ecf6f557ebbb83e6a46311 SHA-1: 051136352f66e60b87d75341a3ef8bfcc99a5f29 SHA-256: 736c9a2fca8efd481d9560bf3fa14f8fab9800ecd324e5c38d78dd9344284b34
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a notable heuristic identifying it as a link farm on disposable hosting, pointing to potential phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://botokaw.ru/award?keyword=reasoning+ability+tricks+for+bank+pdf PDF link annotation
    • http://vinorama.fun/746110905019d5ie.pdfIn PDF document text
    • http://copyrightshelpscenters.com/museum_of_natural_history_scavenger_huntpwfrv.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/gawain_and_the_green_knight_1973_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/gjjgggW/soccer_goals_predictions_today.pdfIn PDF document text
    • http://nesobaka9.xyz/high_energy_particle_physics_job_rumour_milldmis2.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/nugago.pdfIn PDF document text
    • http://idealicacolumbia.site/nomomapalapumujncn3.pdfIn PDF document text
    • http://mebelintera.ru/division_table_1-100eab55.pdfIn PDF document text
    • http://legalvictory.group/lejolisepetaxipuwobh83f7.pdfIn PDF document text
    • https://cdn.sqhk.co/rafopaluko/icUgjje/free_wifi_phone_calls_online.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/natural_admixturesa5oyk.pdfIn PDF document text
    • http://milatepe.medianewsonline.com/adobe_xd_tutorial_web_design.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/83844428526.pdfIn PDF document text
    • http://tugrull.com/toxiloweroromhcu1.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/fHhcjcF/jagilazetegegi.pdfIn PDF document text
    • http://kezijumedet.mypressonline.com/investment_analyst_interview_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b6d3368b-15e1-47c9-a38d-ea510ed8c2e6/how_many_playing_cards_in_a_standard_pack_without_jokers.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/directors_meeting_minutes_template_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a797dee9-fbda-4dd3-a262-540eb6692a5e/how_to_buzz_cut_a_mans_hair_with_clippers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94b2831-180e-42b3-92b7-7efab7f7f9b6/xewoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e22f01-cc69-487e-a0a5-f7c73f040a70/40981704609.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/do_cumulonimbus_clouds_form_hurricanes.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/simple_english_grammar_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/83021178275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ab99a4-ee02-424b-9108-b2e9f7b03833/69237070858.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/fowejiwabolakilakaxazuma.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 5424 bytes
SHA-256: fa228978518cce9c28e7c170edd603327e294bcea7c818300bd0a08eb003ae41
font_01_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 11184 bytes
SHA-256: a56ee376dd03a3cd9913a41a250b157bbf8f98375cf7344a7bf33eed6afc7b3e
font_02_sfnt_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3