Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d791397dea57446…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 03:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c471b411ed587251d68ec43dc328575 SHA-1: 6567a72e3cfd6b48111f777224cbdab3982757b7 SHA-256: 9d791397dea57446d051e7348122ed682d18d1cc24856942dbb7eaed993c0087
134 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous external URIs were found, suggesting a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The presence of a 'download button' heuristic further supports a deceptive user interaction workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=adb+driver+win7 PDF link annotation
    • http://kondicionery-himki.ru/upload_picture/file/paxalitosovevekarasalapa.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tldjk6qnm8a5j3dmdop2g3ot76/fujosonopufejejume.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/70428702104.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/49766099144.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/vevurot.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/mafuletaboxefodel.pdfIn PDF document text
    • https://seger.cz/userfiles/file/31792291101.pdfIn PDF document text
    • https://alariel.be/userfiles/file/54552570419.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zewotasoj.pdfIn PDF document text
    • http://alcantara.cz/data/file/mebalufax.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/tojonovevaj.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/jadomusokal.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/44464279228.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/zokex.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/91639073343.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/43876188336.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/ranozuwuwudewotuwuwe.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138190f9e124---vapabage.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/dakemegoriritipix.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gupewusaxosagib.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/97719769796.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/gisitobozexuvupofo.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20903836217.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/38385214072.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/56880709681.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_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 17824 bytes
SHA-256: fa67be23c34829c8b64bff97ddd89c589532ee82e591e32b8bbbd9d470cb2713
font_01_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 9972 bytes
SHA-256: ab762eed2ed2feb5acbffd45facd289d728c1a23778d303327d553bb51e8cd20