Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e8cbeedc3e0828…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 15:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 391c9c20137ffb7ab9fb1b1d0abb7dd2 SHA-1: c478c15df0f983b85bc979f212c4660cee38aa93 SHA-256: f7e8cbeedc3e0828019733a766827b0c1f13feb8b70fd91d5286bcc5226173fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards exploitation for client execution, likely involving JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=how+does+dual+space+app+work PDF link annotation
    • http://markone-tools.com/upload/files/bizis.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/79081570080.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9b0913787b4886fae27ddce69faf6d3a/wogezukokirapet.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nawivuro.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210908061928.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/41931279407.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135238922216---71210547445.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/zutiwivodulevup.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/31617784628.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/80681302680.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/dixoki.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/wovorizawapote.pdfIn PDF document text
    • http://henca.com/files/details/file/gonena.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/171713319801.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/lafewijexejone.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/vanasafuwuzokowon.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/79047803867.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/vuxilobufojisun.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/fajapagiwamuvire.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/64138367704.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/tumiridapog.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/5452260601.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/95304491285.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/12581443202.pdfIn PDF document text
    • http://adice-area.com/pictures/files/wozadanamadedokapiju.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/jufar.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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 20004 bytes
SHA-256: aac30da9432469eb24e47eb820d02d420e181ea53011e5ba076aba94b111dcb7
font_01_sfnt_off00011746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 10480 bytes
SHA-256: 8d69891595df3557f79ac6baf1ae3b644bb67c2c0388d8ae7d86c721e225c71d
font_02_sfnt_off00012f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1