Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ae21e7d7765899…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 12:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5615f59a5410ea7bc68e0adabb74a16 SHA-1: 8c0f2a84cfb3371343bd54c8290f0186f187e5a8 SHA-256: d0ae21e7d776589972e9fd32edf89b8b3115e2d9063d7ff085719cf14d1ae3be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host further PDF files. While no scripts were explicitly extracted, the PDF structure and its nature as a link farm suggest it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://mh-gartengestaltung.de/userfiles/file/38629159443.pdf In PDF document text
    • http://bachova-terapia.sk/images/file/60862384899.pdfIn PDF document text
    • http://ropesadventure.com/d/files/leguvevaxerogepajogebili.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/bekepev.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/weduda.pdfIn PDF document text
    • http://bankerz.in/qpic/files/xemozalujurirez.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/48803373808.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909203730.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/95728799508.pdfIn PDF document text
    • https://termoformat.md/img/files/60816318399.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e3079a80---putirozetu.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1113612226135e54cb708a.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/pinifivavudelepubava.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/vutetirunetifoxolin.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/95634357839.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/jugaxejagalexek.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/wuwawopanuri.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/34326794076.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/24350442915.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/35790795423.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/j844jttpl72q6qnlpa7nslmncf/6751884937.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/30687377225.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/6658450969.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/27706200638.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/11676851806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+save+photos+onto+sd+cardPDF 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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 15988 bytes
SHA-256: 825839f79a2a18954ed56b1b275632952d5ffc468e13dfbfdd0587cf2630aed0
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 10616 bytes
SHA-256: ae071475cfef62e4907b9aba390551d96c27b6ad97b7aae8e33c1d85d0bce060