Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac70c4d6c9bfc036…

MALICIOUS

PDF

85.2 KB Created: 2021-04-09 22:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fa3d31c9aee1b616ca57280da6409e98 SHA-1: de1ac7281083e8fb4656b1cf44e1faec73292d4c SHA-256: ac70c4d6c9bfc036736e05f974979d7bd6121599060bfdf11068d5ad87a39ad9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it uses a payment redirection lure, suggesting it aims to trick users into changing financial instructions. The embedded URL points to a domain associated with a link farm, likely serving as a staging ground for malicious content. No scripts were extracted, but the PDF structure itself likely contains exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://kuzutuzo.ru/strik?utm_term=dell+inspiron+n7110+battery+ebay PDF link annotation
    • http://soluzixod.66ghz.com/biconic_wireless_earbuds_user_manual.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/wamisijidirobaziseto.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/iAbwwGo/dragon_fighting_ancient_city_epic_battle_simulator_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/jcaR9Vh/racing_club_argentina_shop.pdfIn PDF document text
    • http://grandov.pro/91001470751txk05.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/jiB1jfn/gemufedeparuxosi.pdfIn PDF document text
    • http://pitushok.fun/computer_science_an_interdisciplinary_approachb9fyk.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/wugimalokumoxekamaw.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/idemroS/dog_rescue_puppies_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/gcPialc/among_us_emergency_button_noise.pdfIn PDF document text
    • http://ruvenebigolusep.mywebcommunity.org/63001081541.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://strapslap.online/sairat_jhala_ji_video_songqf28e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc741224-90e8-4147-85e2-f525b99e2eb4/rental_application_california_association_of_realtors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02036d5-5dc5-4ef5-8f09-6f104f3fbe53/tipazo.pdfIn PDF document text
    • http://xarilupinedup.myartsonline.com/49724128633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e1ff99-5891-4a7e-84cc-becb5f9107c6/poginoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05985821-b461-44db-bb60-e91d06f0a55d/manewogefumo.pdfIn PDF document text
    • http://supetok.rf.gd/bascom_avr_terminal_emulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20af43f4-d795-466b-9a42-a1799214c6d4/power_pressure_cooker_xl_vegetable_soup_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f15bc2a-6a34-45ae-b16c-1a36fe715413/lojugawidurukurubatigabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff3bc08-5f93-405e-9dcf-e9cc55ad0c7a/bobitujogefeturiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77fa764e-b5f9-4af9-9352-5edabd893cb9/posie_libert_paul_eluard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee30307a-c239-449b-8f71-131ab8958f00/xisekofida.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_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 5328 bytes
SHA-256: f34fdfe22da2f32ecc2f7a8b9708ca71bd4ad39f519011088d39eaf375a8e98b
font_02_sfnt_off00012162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12162 10396 bytes
SHA-256: 68110b62d08affd3d456802a36648b090af33c6fe0837ba2f3bfc905a5314d6c