Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0476f46a0d3bf7…

MALICIOUS

PDF

76.4 KB Created: 2021-03-26 08:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5af560e1a6915c4f4f449086f8d37304 SHA-1: 8941610e0ab97a9fe496b20823d5afa20ec74f71 SHA-256: ab0476f46a0d3bf712999a0a79e4315e71185321a49ba6a6f794ec174449717a
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://jumiwimov.ru/strik?utm_term=simply+keto+book+pdf PDF link annotation
    • http://disconto50.pro/ed_helms_singing_how_bad_can_i_be_behind_the_scenes34q7l.pdfIn PDF document text
    • http://www19216801.site/what_does_public_mean_in_public_relationskyab6.pdfIn PDF document text
    • http://lasleymarkt.ru/amartya_sen_the_idea_of_justice6sfji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5ff422566a1b3.pdfIn PDF document text
    • http://legiontry.online/philips_respironics_system_one_water_chamber8itos.pdfIn PDF document text
    • http://forkidsshop.online/punamsx2cl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_600a5f70e91fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482413/normal_5ffd46f064846.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/fusabisubujutotobadore.pdfIn PDF document text
    • http://nikaold.site/46614368351h0f63.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/boolean_algebra_multiple_choice_questions_with_answers.pdfIn PDF document text
    • http://crystal-light33.ru/febulibineptd32l.pdfIn PDF document text
    • http://yewes.space/zuxevagusagoganilefivivonyv7zx.pdfIn PDF document text
    • http://usene.xyz/5233299237016wgm.pdfIn PDF document text
    • http://proflist-briansk.ru/jepemofakoguvixunizl3m06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_604b810af2d24.pdfIn PDF document text
    • http://damvglaz6.xyz/how_to_solve_for_time_in_physics_kinematicsvv9bx.pdfIn PDF document text
    • http://pokypka.xyz/how_to_connect_logitech_h600_to_mobileiivnk.pdfIn PDF document text
    • http://harkateine.fun/507776108848x64i.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/bb304869-c83f-4ac1-ae84-9af33c9ed40d/70825465402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88787e6f-8ceb-4b49-a356-675b33d1bec7/how_to_write_a_magazine_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e855eb-f75e-407a-b901-0dba1ac0ae0a/wheel_of_time_book_13_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f791e3-90fe-4180-b14b-0fed3e8a7e23/tikosejidusebifamex.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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 5112 bytes
SHA-256: 835d43408e1e519e2c0a667b938f46e8d48ea702abfe388eb397247af6b12da7
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 10992 bytes
SHA-256: c859c0793d6f5deda732d91c8dce1f4432b080aab589a3235cee3852e967cf84