Malicious PDF — malware analysis report

Static analysis result for SHA-256 570143fe425be8b6…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 13:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ecfcfeda464fc16bacdaf7477eb250bb SHA-1: 3a83bdc37ab0536b9174e2f1de882b5cd7e78b3f SHA-256: 570143fe425be8b6b9737b124d5d934abaaac96e8f77d4aecd4cad76876954f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is used to host a large number of links, likely for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=kumkum+bhagya+5+march+2021+full+episode PDF link annotation
    • http://cuahuyhoang.com/media/ftp/file/dozonisabesamigajale.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/oue1cqa11ajkgh6t6k81r65u47/50020686529.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/28411753160.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/67586750394.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/xiwuz.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/pafinesofosilajuzaxepin.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/46069309106.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/puvepege.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/biropedejuzolusozamabenek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8aa5810e7---36628778478.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b83cbcffa5---fowituramunumi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bevibutofej.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/sejivaj.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/11411899705.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/lerukikor.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/nezot.pdfIn PDF document text
    • http://biosite.ru/images/news/file/4026664106.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/35132550027.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/karolokesiwuvinopejedaz.pdfIn PDF document text
    • https://norservis.cz/files/files/77761371787.pdfIn PDF document text
    • http://balatonfurediallatorvos.hu/userfiles/file/vujawiw.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/25102238779.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/gevofikuz.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/98055229010.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_off0000b1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BA 11728 bytes
SHA-256: d59961385f623e45a666857d0130547afbf8bb54b5193ad65ccb97d48fd1531b
font_01_sfnt_off0000cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 16816 bytes
SHA-256: 870f48eff108222df7e5984ac797b9ad0743ab5767a63d4168bb190519bb365d