Malicious PDF — malware analysis report

Static analysis result for SHA-256 88259415cae8c375…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 01:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fee46e7b749bd43e6bee6eff0f1571e3 SHA-1: c8d6d82f2c184bfa0254f1f1b5e480d88b3ab2cb SHA-256: 88259415cae8c375ed2c1fcafdd8777763de9beb8539b1b8317236f2c9b2a47a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as a phishing trojan. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links to potentially malicious or disposable domains, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted, but the overall structure and heuristics point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://tutorsbureau.net/userfiles/file/16487105693.pdf In PDF document text
    • http://soupworld.de/upload/file/vabat.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/30580143029.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/332543952.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/luboxetizukeve.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/15/file/fisava.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/xelusu.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/55563154783.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/pukazafuwujufefeme.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/doxejedunabakasezewolevat.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/7449359995.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/kefusegurepejunarurop.pdfIn PDF document text
    • https://termofriz.rs/files/45853492238.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawijor.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/solijazogozomifegavowot.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/gozabedof.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jfqjde7flo5slg91is2u4srqti/67186890668.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/22133440460.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/56822471352.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/jozugezupisasab.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41b5286ac---vusorukasuse.pdfIn PDF document text
    • http://hevolta.com/upload/file/jipizogovaponadonura.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/70925331604.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/27892066246.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/fezuwegaboza.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/gogapemosaxunun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+full+episodes+onlinePDF 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_off0000c7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DD 19960 bytes
SHA-256: a7d55f22a31a488725fc81838036b66f484a42f329181919877ca79dd819423b
font_01_sfnt_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 10876 bytes
SHA-256: e681cbc360ce46841acab41f78061c5263692366524afe609375ed9393ae0207
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1