Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7c1821e2eb3f93…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 16:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae6353ee35c719fa8194edb6e344b4f5 SHA-1: 71603d0cea8b4a084936ddd59b74c9229323e73c SHA-256: 5f7c1821e2eb3f93b3b01cac06dec06658fc1dabed2528d90b5f656341ece03d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to PDF files on various domains. One such URL, http://studiodrago.eu/userfiles/files/zapikon.pdf, is identified as a link farm on disposable hosting. The ML classifier also strongly suggests maliciousness. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

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://studiodrago.eu/userfiles/files/zapikon.pdf
    • http://strandedtattoo.com/file/levudujofawozadu.pdf
    • http://thaide.org/userfiles/file/zatesogadixobo.pdf
    • http://baozhaopharm.com/upload/files/48400749923.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///76553968299.pdf
    • http://artospace.com/pics/file/89769366590.pdf
    • http://metamorfozyayincilik.com/userfiles/file/barozovodugizivafude.pdf
    • http://niezapominajkowo.eu/userfiles/file/kukirugowosupazawozeteli.pdf
    • https://booburger.myagenda.cz/pictures/editor/files/sarizo.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161341ded42e63---9920096797.pdf
    • https://adikketiga.com/contents/files/14236656652.pdf
    • http://daeryuhealthcare.com/ckupload/files/temezifelakirarok.pdf
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/85291923390.pdf
    • https://manuscripthandler.com/userfiles/file/28184407656.pdf
    • http://dreamsurgerycn.com/ckupload/files/tojezeniveno.pdf
    • http://hotelgiottotorino.com/userfiles/files/sukumiguvokugamuxirab.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/48485528475.pdf
    • http://julianina.dk/upload/file/17100266998.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/578f618008d5e33b18035cf61a7e68eb/72899667596.pdf
    • http://toitureetfacade.fr/data/Files/zologopumovosopu.pdf
    • http://zagazzo.com/userfiles/file/digoduxepuxugal.pdf
    • https://thehouseproduction.net/file/8046723566.pdf
    • http://www.terresdescaraibes.fr/file/modudofi.pdf
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/44049715306.pdf
    • https://lmbri.com/WYSIWYGImage/file/zofidaguvisubibedugewit.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=denon+commander+sport+manual
    • 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_off0000e21b.bin
b7d02b218c15c2addf754c0357b5bcd5e6d6ff204316da2ec2e10b6bb16a688f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21B 10684 bytes
font_01_sfnt_off0000fa9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 16792 bytes
font_02_sfnt_off000112ae.bin
c0d0d1f676af8ec7dc0bff47e586f64c83db1733fd123642020f94e088d3ef0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 18768 bytes

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