Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fda13160238cbd2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 07:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0bc53eb46a8ac4b5fd97c20d2135d46 SHA-1: 53e452d8ef44cf9d7487d146cfa1387c369ea076 SHA-256: 8fda13160238cbd2c3abad70f0d498766dafb8ee0231e43bfed5605a19d498ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable or suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to directing users to malicious websites for further compromise.

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 http://hide-bo.com/img/tmp/file/zaxudewisopupowak.pdf In PDF document text
    • https://mosconi.net/userfiles/file/budosupimobi.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/vovago.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161414652a8257---mazekoxozoralebobi.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/mapuzuk.pdfIn PDF document text
    • https://techlan.pl/files/file/getado.pdfIn PDF document text
    • http://bushurov.ru/images/files/gusatajudapelukidim.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/30397950757.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/vegalabinapexutozaf.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/5801835285.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/pakevumozin.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/50259921305.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/10412655004.pdfIn PDF document text
    • http://philipsphotographystudio.com/75033944600.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/towutojaradisuj.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sogaruzefujagi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fa14c688---bevidej.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/legoloxepapeberarezoko.pdfIn PDF document text
    • http://artio.pl/files/files/19380741.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210909051439.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/nonusedezimexurigamigoro.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/71405eb43a52e75243f725ce65c0673a/38889244176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=abtalk+call+appPDF 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_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 9864 bytes
SHA-256: 643c0b6d8691b6f68309270d9b133f7fad463925d44f97564e66703dcc6d8a48
font_02_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 17260 bytes
SHA-256: d0abcb1f9e94c47098f5a5504d48378ff8fc864c8c42a8e4df067ef6e9915236

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