Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00a47d6cc10b8f7…

MALICIOUS

PDF

88.6 KB Created: 2021-10-09 02:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f9bd436dc4ad1935e4b3f7d7db52dd9a SHA-1: 5f423227fc2e8b013f0102d727ccad99ab4d149a SHA-256: c00a47d6cc10b8f724cbc3449ebc9cb2eafdd24fbb2a574da9583d55689889d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or malware distribution. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=graphs+of+polynomial+functions+calculator PDF link annotation
    • http://bekkercoon.ru/ckfinder/userfiles/files/43403971790.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/67088285684.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/85537854864.pdfIn PDF document text
    • http://manu-transport.com/documents/file/pikeganizipilupifalola.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/kipotavamuxalonivenato.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/nuxomidur.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/tizufigavemuj.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gamisuxekex.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/5523000141.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/47586790753.pdfIn PDF document text
    • http://fikszo-whc.com/userfiles/files/15668537680.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/mexevisi.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/polekovifibezironabi.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/10243748273.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/wapugarosib.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/kafexawasamuboxisiguses.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/polazukugunox.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/34595483962.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/67950367448.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369fb0bf480---nimiposa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615bb3c70abac---simexasarogevuwelu.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/68380231060.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/vevewuwiwer.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/72975058965.pdfIn 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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 10868 bytes
SHA-256: e163314492014c598bcc4d2e4308a9ba7c1ee466eeec78d55a8ec3ec4d1e460f
font_02_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 21472 bytes
SHA-256: b0f3e0889fd80a8960e84a53b98520fa7d50d81888556455c82ec5d1e14d481b

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