Malicious PDF — malware analysis report

Static analysis result for SHA-256 a853b16e1c165c58…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 11:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf052d496ac8979cd8487da8e52a200c SHA-1: 9748274fa53b7fc7fa9f82909f8bc6aad2e6acda SHA-256: a853b16e1c165c582b3eb2bb5008c93b68ba254be3550552c01cb8f5f3e931ef
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and EMBEDDED_URL heuristics confirms the intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

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://inwebjor.ru/uplcv?utm_term=the+sims+4+apk PDF link annotation
    • http://ottomaniantextile.com/userfiles/file/fegomume.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/88593297123.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/2970613737.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/tolupelerenos.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614163d79b5b7---razerekamegofado.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/46520216508.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/jamabaf.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/noledunebozupan.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/nelevizozakuwivosaguvubu.pdfIn PDF document text
    • http://ausafe.net/images/art/files/kujeposigijerexogitapu.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/bakalegetivuwugamopobijub.pdfIn PDF document text
    • http://orthodoxnews.us/file/ralilavalagufipas.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/sixegavilebezigudo.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/80225859274.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/mogaxilijofuze.pdfIn PDF document text
    • https://renault-service.com/userfiles/71921637433.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/botexiz.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/donobisuz.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/83248535607.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/tajobifijapusiw.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/rodegupipopamodadezuv.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/ravodajetowimuzugadat.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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 17436 bytes
SHA-256: 18f7b12b3dc63190ac94e388ff3166c49cd03fb122fb24239d498e0f032acba5
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 10184 bytes
SHA-256: 80b05b0123fc9996549c702b14b8981ba5dd7d9da520a8f654ac5b35a07b6671

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