Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f10e406780d204b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 11:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0794cd682691de3200d27adcc55df80 SHA-1: b0010f9f019f531dca802bf5bc32f64c9c18686a SHA-256: 8f10e406780d204be087278be83c4eaed9aaf112453f035527d631edeb0eb797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://premiercontractinginc.com/files/file/28388714901.pdf In PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/61044134321.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/64303006825.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/wosibew.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/95899853139.pdfIn PDF document text
    • http://jljemc.com/upload/files/xafefopefixudulunezaj.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/57327470308.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/sonadosobigupogu.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/timunevamozofelexu.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109090852152732.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/42904246638.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/tavakifaduximibot.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac51cd18ad---malulonareraxopipiru.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/jipaxu.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/73193256006.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/21648027263.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/3481159869.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/76646602869.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/zaxufanojoluxiladerako.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/burojabawojazadufafifevir.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161348c11030ce---84234689566.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/rekavupofoged.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/67724782560.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/58940233535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+vpn+chrome+argentinaPDF 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_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10652 bytes
SHA-256: 3fa555d513cc5e1ff00b19410503eed91518c7e847896562f9dc5ebfe016d0d7
font_02_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 19212 bytes
SHA-256: c879486ad8cd29a8901e0eec76780ef37be06f84a28ae6db9899b448e5ddaa82