Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5f8c4ddd9736f0…

MALICIOUS

PDF

55.7 KB Created: 2021-09-20 10:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd0a3941f77401fc85b5c2ad7a3c387a SHA-1: 981d9f936f3e38c60c27bd7340c2dcd70a092a90 SHA-256: 4b5f8c4ddd9736f04fba1fdcf81c8bd3a93c88ec239d54627447c7546ba9f593
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7449

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://allytemp.ru/uplcv?utm_term=swamp+attack+mod+apk PDF link annotation
    • http://cesarrodarte.com/userfiles/file/74027714007.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420ede2a00c---zupuwogivenowejemiwaf.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/xatoxajivaxin.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210918193808.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/57132965551.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/keposewel.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/72079952883.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/61449913681.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/59738142456.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/itojaj.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b279c43a5---83582350348.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/noleko.pdfIn PDF document text
    • https://actor-conseil.com/files/file/71202125178.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dogudeduleluropusowuro.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/2121731793.pdfIn PDF document text
    • https://mauspro.net/upload/files/20426618329.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/lulene.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/44228786893.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/samavefo.pdfIn PDF document text
    • http://airserbia2009.vs.rs/multimedia/file/loxajawupajoladekafezi.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/48777301733.pdfIn PDF document text
    • http://castel.lu/userfiles/files/86290827101.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/wumivokux.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 10288 bytes
SHA-256: 05d5be4d568bde3c5a1a4d3ebc14ed988a067245ecfdfebad5e5b8c22002d93b
font_01_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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