Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4d6d65a27e5420…

MALICIOUS

PDF

78.0 KB Created: 2021-09-11 04:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d730e98604a685b775d43f1c1da831d4 SHA-1: d802da7fa11706827156c1c658745184b534466c SHA-256: cb4d6d65a27e542005a2f8907fab27c7babcd320cb5efcb9fa16f8c7b7ae4847
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, with numerous external URIs pointing to potentially malicious content. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://cosmikkino.ru/sadm_files/39602424444.pdf
    • https://autoteam.in/ckfinder/userfiles/files/fazujovilefibod.pdf
    • http://wxmx.cn/upload/ckimg/files/202109082112524274.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161352ad606b89---71939589259.pdf
    • http://atya.eu/files/file/sovovedoxap.pdf
    • https://doxity.ro/ckfinder/userfiles/files/43551601877.pdf
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/32081409249.pdf
    • http://movietek.vn/hinh-anh/files/88522179420.pdf
    • http://refpecsbelvaros.hu/kepek/files/82354319370.pdf
    • http://unewstoday.com/task/userimages/file/75975833251.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/fudonug.pdf
    • http://sunnysolutions.it/uploads/assets/file/15210872704.pdf
    • http://siripanyalamphun.com/user_img/files/59048271188.pdf
    • http://delannahotel.com/user_img/file/wibeta.pdf
    • http://btfa.tw/upload/files/75528664210.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/kekiperabigedonijuxo.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/11787231490.pdf
    • http://traiteur-ribot.fr/userfiles/file/fipuxoposobomom.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/19602075731.pdf
    • https://ihappywash.com/uploads/files/202109100818318127.pdf
    • http://dentalweek.eu/userfiles/files/69146598279.pdf
    • http://santamariamikado.com/uploads/files/ramafesukekefi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sincronizzare+mail+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae6.bin
26952047b3af9b035637a9d8795cc590448228e72767ebd52e5760a1cadee8fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 10400 bytes
font_01_sfnt_off0000e25e.bin
775022dc251fa538f0b43b5812c200354af25828b7126246d791ab3cf302b4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 18428 bytes
font_02_sfnt_off00011297.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.