Malicious PDF — malware analysis report

Static analysis result for SHA-256 e581fd5c6694c39b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 11:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68ad0b1a21942c390aeb3c6ac1d7101c SHA-1: c21d91df1b774936e8effb38f49c4d12a20ed8c5 SHA-256: e581fd5c6694c39bc63a77887fab0794c48fedb4f8bc9017091324f38512af26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's used to redirect users to potentially malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://clubselectionvoyages.net/images/file/fipok.pdf In PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/85253408459.pdfIn PDF document text
    • http://gskrem.ru/img/file/91062574662.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/56508255601.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463f51f4089---wijataxivija.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109072047104349.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/84038789123.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/26704080323.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/texagulategesufadu.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/40040743017.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/21371057008.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/93074135042.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/76459271047.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/89506989750.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/71968594364.pdfIn PDF document text
    • http://garderoba.sk/images/_file/walomobutevimupemami.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/7637212237.pdfIn PDF document text
    • http://lg-palette.com/upload/files/67056072564.pdfIn PDF document text
    • https://tsegypt.com/file/94037279437.pdfIn PDF document text
    • https://mytopics.it/uploads/file/muxufavotede.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/xepowegolexi.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/7477461009.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/38194779352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+game+download+apk+androidPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/zobijoxakirulidado.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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 17404 bytes
SHA-256: 2c317e85fc8e9efb8e96f71812b520c45af1e089de717d730d786a7ec28e20af
font_01_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 10920 bytes
SHA-256: 86ac0335f4b948416a379f393b57c479e51586f35cd72661dfe2df1c21e99c4c
font_02_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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