Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77b4fb28dd2fe61…

MALICIOUS

PDF

127.9 KB Created: 2021-03-20 00:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 75a36af8c0c9ff077a0e87a8aa56b27d SHA-1: ed05f6d068b4c0d487135232a717357cd72f3ad9 SHA-256: f77b4fb28dd2fe61e64e95516c860b564b0bd67865208ae9ddbe528d89e8b531
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary URL identified, https://xezojetit.ru/strik, is likely part of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://xezojetit.ru/strik?utm_term=yard+machine+16.5+hp+42+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450243/normal_600cf8187ad95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417046/normal_5fc768cc85bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483088/normal_604ec37039bf4.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/pak_study_mcqs_10th_class_in_urdu.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/online_editor_google_drive.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/iigtjiC/best_jump_rope_exercises_to_lose_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/fhgPjaE/theme_park_and_waterpark_near_me.pdfIn PDF document text
    • https://zitakutuseg.weebly.com/uploads/1/3/5/9/135994262/2306542.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/aircraft_maintenance_engineer_course_in_india.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/59615655688.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/Agihhg1/find_my_friends_iphone_location_services_off.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/eihijGf/one_punch_man_destiny_rank_x.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/RIfhht7/anti_slip_sheets_for_pallets.pdfIn PDF document text
    • https://lipemegovaw.weebly.com/uploads/1/3/4/7/134766771/537284.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/f6f5b0ffab5b0b.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/880c9b76-81d0-45e6-858c-e21697c0fae9/toyota_yaris_2007_for_sale_olx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be45246-0934-49e4-8e74-5bebca29a17f/98832061188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca934259-a08e-4a03-8f57-72496a24672d/diy_gun_cleaning_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8fbab0-dc37-4360-b4c9-b782b8c9f026/tipos_de_fichas_tecnicas_de_productos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef71430-a559-49b8-80e9-8d0cfa0d1bbe/ruwovojugirisino.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_off0001b7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7F0 5824 bytes
SHA-256: 95aae75a5d8a085b27b02b6f2846aca12651e0c0e2838b926b4cc492ababa21f
font_01_sfnt_off0001cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB3 10852 bytes
SHA-256: 9c992074363ea3f44aa3057d5302916d8ef6887cfc6978b025db3437b6fa6158

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