Malicious PDF — malware analysis report

Static analysis result for SHA-256 5115ef2ac6abf74e…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 06:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3f333e36ec793159aec242f189c6349 SHA-1: a3fed72d5ad135fb319490b86c1cf8095a1aaf6e SHA-256: 5115ef2ac6abf74e44e191a380de5f50181e1712cbfcba35f3852dff3313a072
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable domains, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=piratebay+proxy+of+all+websites PDF link annotation
    • http://cnmrobotics.com/files/files/50747623257.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/dokejawadovizakerosujoxoz.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/70005703940.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/tonerukusaxekuxibiwaruli.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/60432260144.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/xopobon.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/sasitolexigazuzuwo.pdfIn PDF document text
    • http://yanartextil.com/firma/files/54500000484.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea1b82bc2---84093772135.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0ccba111db2b39246a275cccd48ff11a/xipilunewerovixan.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/vonalujawomiv.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/36551431097.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/67453388443.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/92504101291.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozogon.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/41063184072.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/29542576073.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/tokipukavegeg.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/jubasitozesopozasajiwul.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/xemolidatemuguworojidoliv.pdfIn PDF document text
    • http://opsir.eu/files/file/33700927093.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kerepuralukilulunado.pdfIn PDF document text
    • 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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 10688 bytes
SHA-256: 09f9feb385cef7f54d197f0de076ddba89ac17aab4d42bcb6e9cf78a11143d2b
font_02_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 16848 bytes
SHA-256: 6bb6ba64e59d4ec2b245d30310621f684126ea4030e3245cce6df749718e5ada

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