Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a72403259ad0f71…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 22:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72989f04e7a50709db58fb48ffbfa6fb SHA-1: 55ddbead9b6826233b408a4293af3a8810dd41a0 SHA-256: 7a72403259ad0f71ffd7006d81fce3cfe1da2784ce07c37824c2213c846abc27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to various domains, likely intended to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically suggests a tactic of using disposable hosting to obscure the true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://skywaytravelandholidays.com/ckfinder/userfiles/files/74221937091.pdf In PDF document text
    • http://movesearchesuk.com/userfiles/file/54947362499.pdfIn PDF document text
    • http://raovat.coi.vn/uploads/userfiles/file/30092330729.pdfIn PDF document text
    • http://newshop.jp/archive/file/sasubuwoxetuzuxiwavu.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/wixatuwutuxepexanofifu.pdfIn PDF document text
    • http://japhina.com/upload/file/robatowovu.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/noxinexedede.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/ravuj.pdfIn PDF document text
    • http://splogservice.ru/content/file/62982052964.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/borovemajasexitularef.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/11718331891.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/vovozonuwadomakemavu.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/37877107164.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/wixivijumetotisuli.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/fukasajinijivijikejaxip.pdfIn PDF document text
    • https://beautydent.hu/editor_up/9430225026.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/27480056016.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3eb27bf94---salunufinuxuverig.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/tafet.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/xisozalenajedan.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/56327064066.pdfIn PDF document text
    • http://szhlfz.net/upload/mubagatotul.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/ledepijegoxatamuwoweri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bohemian+rhapsody+watch+online+123moviesPDF 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_off0000adfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFE 15404 bytes
SHA-256: 2ef71fb1424ac8c3962e0cbabddccc3120a76eb4df4ba23673b7cef736dc3118
font_01_sfnt_off0000d50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 11440 bytes
SHA-256: 918468366f6ac3750d4d7bcb66bf6743fefffccb67b83613b6850b9791aeabbd

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