Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3a6e1509a57900…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 14:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b6583d7b50419143291ef70b1bcaf155 SHA-1: 18f666169ab93ce7a7e6efd64b87d06c56466855 SHA-256: 9e3a6e1509a579006b730e9b3f8e01b3396e74ca6a2431f935a0244f3c57906b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The presence of external URIs and the link farm nature suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://queure.ru/uplcv?utm_term=how+to+mod+gta+sa+android PDF link annotation
    • http://tractortools.cz/ckfinder/userfiles/files/vufesakojogejobitavidoja.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161319ea85a56f---38121557163.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/kudinadupidusotafozefinu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wasimikonaronan.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/85108651105.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/zunadufefuwekedemerujipu.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/15669095939.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tuwunajidubekedizaj.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/bezatufamatapusabemagaf.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/62920990265.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/terejosirimoxemepozobe.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8e5ea8bf---64272975903.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/sumafojebamalobobapeg.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/vagifurofatidobunu.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/14354404963.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/55667077297.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/48170122092.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/40657196778.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210906220304.pdfIn PDF document text
    • http://citty.org/images/uploads/file/juvedasajaja.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/zanilemadonewiza.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/12643544133.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_off0000ad7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 16476 bytes
SHA-256: a6a90e1c31f67317190075745f776a1c68f740bd535111f1334fb76cccc1e688
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 10492 bytes
SHA-256: 4bb977c95f1b229e28f5fc74c4290188d9749caa198cd4b5da7f576b5476bd27
font_02_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1