Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd63ebd96baf446e…

MALICIOUS

PDF

70.6 KB Created: 2021-03-07 09:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: a7d1294d7e76de62eef698071f4a9622 SHA-1: 17175eed1c8d9b9b381f1964099ca449b9bcd426 SHA-256: cd63ebd96baf446e178a944b4cb2db9f6c8d68c8edd67b347f2674612b8ccf1b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs and the heuristic firings point towards an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://druttle.ru/strik?utm_term=esl+verb+tenses+exercises+online PDF link annotation
    • http://subonus.ru/fabupujakugumugifejisarvt1.pdfIn PDF document text
    • http://kellys.space/levedakonugapadexc7xj.pdfIn PDF document text
    • http://scarcebook.com/wopakolotoj0dvt2.pdfIn PDF document text
    • http://tihefers.online/39093436064j0slp.pdfIn PDF document text
    • http://vebumugaw.22web.org/25475204641.pdfIn PDF document text
    • http://lovechat24.club/podisagilesefenixigiweled0c2y.pdfIn PDF document text
    • http://usesol.xyz/rurogaxikenupezegm2548.pdfIn PDF document text
    • http://naturwow.space/trombone_quartet_sheet_music3p7y7.pdfIn PDF document text
    • http://itanah.space/xolatidiruxenesgqzg.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/nimuwet/free_metallica_ringtones_for_my_phone.pdfIn PDF document text
    • http://bunokulenixa.epizy.com/gapijod.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/aa_ee_oo_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/11555259623.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/computer_networking_a_top-down_approach_featuring_the_internet_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/honeywell_chronotherm_iii_wiring.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/centripetal_force_definition_physics_a_level.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_f856d8940c75486d99893357a190d7d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/cisco_packet_tracer_answer_key.pdfIn PDF document text
    • http://sojusubelifaf.epizy.com/50085751262.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_2f8a2bc0386545a186e01a849b8942ef.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_e165562ca70a4f898319d32c1058fc57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/singapore_passport_photo_size_template.pdfIn PDF document text
    • http://poposumezaxek.rf.gd/dr_brian_weiss.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_918537e72eed484f8351f3bae34cec0c.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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 4808 bytes
SHA-256: ccb20bfa4446cb142274af76787bc76a245016e2dd4105e4a95bfe677b4c7c35
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10436 bytes
SHA-256: b44534f03c4aadd51ed0f413a4fe7bf15878a91d740837df13961e0f26eeacf5

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