Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a782124453363a…

MALICIOUS

PDF

77.5 KB Created: 2021-04-01 15:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f1a69708175e0d436f96cd711c36ecae SHA-1: 5f37f7891616c5ba2e1180ecb3936114269b6b52 SHA-256: b7a782124453363a34d068f36d3ff9284c03c20aeacc8ca0a2c1d635a00ec48f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting domains and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The primary malicious URL identified is https://seumenha.ru/strik, which is presented as a search result for 'Audio technica lp120 usb speakers setup'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=audio+technica+lp120+usb+speakers+setup PDF link annotation
    • http://rowaxuxot.22web.org/51595657569.pdfIn PDF document text
    • http://tameenegypt.com/2774661751250ww8.pdfIn PDF document text
    • http://legendbilisim.com/829150489604wdhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_600c082e6fe10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446634/normal_5feebbfd55357.pdfIn PDF document text
    • http://formverifiedbadge.com/8326057045uydt5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_60501f92dd04d.pdfIn PDF document text
    • http://rinavorepem.iblogger.org/what_are_the_different_kinds_of_academic_text.pdfIn PDF document text
    • http://detonic-italia.website/danirajenusuraqifcq.pdfIn PDF document text
    • http://nogivubuleduwi.22web.org/11791761321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd66ffcb70a4.pdfIn PDF document text
    • http://topcreditreport.info/hp_laserjet_1100a_scanner_200_driveremqpr.pdfIn PDF document text
    • http://hhizmet.com/conversational_intelligence_book_reviewtlgpl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407793/normal_60199d9eb307f.pdfIn PDF document text
    • http://glasshookahcatering.com/what_are_the_benefits_of_tai_chi_and_qigongk60vi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lepomosafajuki.rf.gd/dajenekirivureguzidero.pdfIn PDF document text
    • http://perabojon.rf.gd/94044734906.pdfIn PDF document text
    • http://bufixel.rf.gd/ldc_answer_key_2020_9_september.pdfIn PDF document text
    • http://pejulok.epizy.com/95443232932.pdfIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_e12a37a3edd6497bb34c9041deea93b1.pdf?index=trueIn PDF document text
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_a4bf045fed094f5fb1dc41b9779ede55.pdf?index=trueIn PDF document text
    • http://jesegusanasukan.epizy.com/weber_grill_cover_genesis.pdfIn PDF document text
    • http://kenasaxoxaxober.rf.gd/asus_z87_pro_bios_reset.pdfIn PDF document text
    • https://42f4b946-f871-4f2a-a73e-6571c6569919.filesusr.com/ugd/e20521_b7083dedc23347a28e87dfdbf865361d.pdf?index=trueIn 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_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 5680 bytes
SHA-256: 52049253cd1e28d7674933bcc4440f917cf960395978f36cb3ef52dd197c0113
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 10556 bytes
SHA-256: 26ceb0e98c19f97ae6d1d5bfdfc2cdb742ea71f3ff8f1f048390e8faf450a721

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