Malicious PDF — malware analysis report

Static analysis result for SHA-256 724926525672c012…

MALICIOUS

PDF

76.0 KB Created: 2021-03-13 19:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8bc25f534de980fc201e96bc52a398cd SHA-1: 276ff83bc10e0812f391302c269916eafc59159d SHA-256: 724926525672c012ff0d5530e836d6a32895a48af1ceaf7a16f3c7d83f7755bf
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded URLs and the structure of the PDF point towards a malicious document designed to exploit search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://botokaw.ru/award?keyword=speed+control+of+ac+induction+motor+pdf PDF link annotation
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/nugilalisumezen.pdfIn PDF document text
    • https://cdn.sqhk.co/dunenilufa/igMieu2/naming_alkyl_halides.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/ojcY6HF/xunasegiresogisapuwinisud.pdfIn PDF document text
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/fesarofuso.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/ahckjjj/sony_crackle_app_firestick.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_602dea8fc681f.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/h2vIwQP/wavopezuguluwusalate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fffcade5de11.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/fmjj0jg/tuzir.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/igcIjcU/guide_for_pokemon_sword_and_shield.pdfIn PDF document text
    • https://rujemadatidugu.weebly.com/uploads/1/3/4/7/134747735/rekidujelojesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_604949c8971cd.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/liislhd/atif_aslam_songs_2020_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389571/normal_603da56e10712.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445737/normal_6003638577192.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/agdjhig/firing_ball_fire_shooter_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/sumavevop/gdnifhg/xovunojevazemikib.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/4sPKhfP/xemibebejuraxixuxarip.pdfIn PDF document text
    • https://difototasewi.weebly.com/uploads/1/3/5/9/135986065/5931786.pdfIn PDF document text
    • https://lefiluke.weebly.com/uploads/1/3/4/8/134887161/415cc18481d00c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_ec977a7344af4c00a06c345cf4eb550d.pdf?index=trueIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_e2c6c66848b94275bb7bf24f94e327d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/87275390273.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/46504428033.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/what_is_the_weather_for_washington_dc_on_january_20th.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/nipamamedumavageja.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/temperature_conversion_worksheet_answers.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_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 5228 bytes
SHA-256: 84044bbc501b931667fa1e77cbfceee9e6740516bee29ad1fb5de956acbc6326
font_01_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 10440 bytes
SHA-256: c2afc57e0f2fc7b30118bab4927cc9ce2267ca54ddbfa10dc26fffeed8e81e17

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