Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f2f2cb74b79453…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 08:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82d9d0306ac8c7bd2d84818761c9c2f3 SHA-1: 2ac91a7b8b94dcdb7083055f59426dce5a0da582 SHA-256: 96f2f2cb74b79453ddbae4dfbce30ee7e8e6018e8d97aada5ab66f264056c966
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing or redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://fli.edu.mn/ckfinder/userfiles/files/lowotule.pdf In PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/36246265574.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/korusixasatukonefubajom.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/fanuleginumezoferuderamok.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/67851741219.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/kadokekilotigoze.pdfIn PDF document text
    • https://dhesient.com/media/36311731541.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/jevoluzexamolusugotatofi.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/lakemedu.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/86996466428.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/pozaripirobofe.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210918124537501856fxri9.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a66e5e7adce330a7599b0d722b207187/47268931539.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/40152425930.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5067875699.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/jebogafirekabam.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/39798723180.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/55054911066.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/rovawuvubipivutafiluj.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/rotigabavigitupitele.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/65391951314.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390af6a1c60---26701103872.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-11/210911061512922511ej2xvrwcicj0.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/negebonigidas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=epdm+glass+transition+temperaturePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10816 bytes
SHA-256: 91c24e258d311d9bc835d8f402dbf08910a13b51528df393d0d895a2a4bb1c0c
font_02_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 18864 bytes
SHA-256: 26088be548809fdd536cc5a4ce3e55e81d58ca8a595a15d5d7902207b7eeb125