Malicious PDF — malware analysis report

Static analysis result for SHA-256 15741d8440d8e12a…

MALICIOUS

PDF

94.0 KB Created: 2021-03-24 15:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0f31b07a4a5ebd2347e68a9ffd7f6b6c SHA-1: 4d032e97c2372ab3202c49f0eab40d3bd60dcf13 SHA-256: 15741d8440d8e12a67cbea9787995e80ff4b35c3cf8d246332fdefbaffb5ca88
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URLs, particularly 'https://nipisod.ru/award?keyword=prevencion+primaria+del+cancer+de+mama+pdf', suggest a phishing lure related to cancer prevention. Although no scripts were explicitly extracted, the PDF structure and external URI firings point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nipisod.ru/award?keyword=prevencion+primaria+del+cancer+de+mama+pdf PDF link annotation
    • http://smilex.club/dishonored_2_keeps_crashing_pcq186l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489056/normal_602e5714bafb1.pdfIn PDF document text
    • http://raftgjgr.space/geratugexazjyn8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_6039b9dcbc8b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_600883e297bca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450428/normal_5ff118dd1ac7c.pdfIn PDF document text
    • http://blockingscenery.com/35589531293v8d6s.pdfIn PDF document text
    • http://uorott.com/97905001178qukxu.pdfIn PDF document text
    • http://cosmeteca.com/slouching_towards_bethlehem_essay_listcvl47.pdfIn PDF document text
    • http://lovemecompletely.com/age_of_empires_conquerors_no_cd_crackjsvy1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5fc61a63ccef2.pdfIn PDF document text
    • http://help-copyrighteamservice.com/15000143985uhozv.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/43766837821.pdfIn PDF document text
    • http://sberbank.link/frases_divertidas_para_el_telefono_descompuestoue58z.pdfIn PDF document text
    • http://samoe-samaya.ru/60738673253lbwbr.pdfIn PDF document text
    • http://help-copyrighteamservice.com/how_to_get_a_street_vendor_license_in_las_vegasmg6mc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/bibliography_example_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/adrianna_papell_black_formal_dresses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81eb0705-aca8-4bda-b11b-e0b42ddb4d5d/xawizokub.pdfIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/acs_organic_chemistry_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/public_speaking_skills_training_near_me.pdfIn PDF document text
    • http://nakogis.myartsonline.com/polarity_therapy_randolph_stone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b8eea6-6b91-4bff-ba3b-a4e90b92900a/rovat.pdfIn PDF document text
    • http://xobeminal.atwebpages.com/80324914501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3b6140-af60-4bcb-8a86-3cee182fad6b/92457700110.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/gepivuretefoxolirusisez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d09b0a-5f78-4740-99f2-331945e27c75/2010_camaro_for_sale_in_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23137a4-1ef8-4392-a8bd-13ad45dd44a7/49912917169.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_off00013210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13210 5184 bytes
SHA-256: 2b5d212b56fbfab68636e78e534dc93c19db4208386f927d1f90fab628a8f84f
font_01_sfnt_off000143a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A9 11300 bytes
SHA-256: d2b734e6844680e226a9ce5581b4ef0845955d4e9136609901c77f5184413de1