Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4127eb9ad181740…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 06:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ac2c54dfe575a15c02a3c6bb758ed64 SHA-1: e963899fa746e266a9f79b1ebe646ed487f3262f SHA-256: c4127eb9ad181740494cddeaea37467ccf54d06b1b3839363a97d932feefa64c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://extrastyle.ee/ckfinder/userfiles/files/tunilizofowos.pdf
    • http://laconchigliacasevacanze.it/userfiles/files/mijaviweketikuvo.pdf
    • https://faktxeber.com/resimler/files/25813139389.pdf
    • http://reckdance.pl/userfiles/file/93363785780.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/95513775810.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/wamezotimifubam.pdf
    • http://shahnawazonline.com/uploads/files/xojenewevovekoviligodu.pdf
    • http://teleinwestor.com/userfiles/file/remexu.pdf
    • http://axiomestates.com/userfiles/file/97247711186.pdf
    • https://cantarefides.ro/admin/userfiles/file/80372375936.pdf
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/39653662877.pdf
    • https://otoform.com/upload/ckfinder/files/nazeti.pdf
    • http://tsrmmessina.it/userfiles/files/76955046346.pdf
    • http://vasset.bg/userfiles/file/16072244176.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa7d8610e---pigulapigosezobuf.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/71772605403.pdf
    • https://accuratesearch.com/userfiles/file/kexawapovesasijutigabigo.pdf
    • http://bezpiecznamlodosc.org/files/file/12510620726.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/jinewopalatitawu.pdf
    • http://3dprofi.net/images/uploads/file/82304617222.pdf
    • http://tantos.jp/js/upload/files/76164343436.pdf
    • http://botosani.ro/img/uploads/file/89479106729.pdf
    • http://atthaya.com/file_media/file_image/file/tilovofewonetiximikup.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/gibogaregif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=400+in+1+game+apk
    • 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_off0000b0a6.bin
79b847de43886ea88a797c460065fe26189f8787632a870b1df621a3f7a92df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 10308 bytes
font_01_sfnt_off0000c7e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 16792 bytes
font_02_sfnt_off0000dff5.bin
6cd3c6b0201eb4ea592a612a6e8e1da7035b910bed1928480f2f2005f7043004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 17012 bytes

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