Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc5ebd998bd4d4c…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 07:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3dc8f17deedc342ebd682fe0e28881c2 SHA-1: 805208e04ca5a95a2ab6057f541153fee4c2afc0 SHA-256: 9fc5ebd998bd4d4c273832ccd0a0af17ad55632ad9cf0c4e9519892bff643d0a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to disposable domains, indicative of a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic for a 'download button' lure further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=media+notification+android PDF link annotation
    • https://nezrenpin.com/calisma2/files/uploads/55343213437.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/timazijoberolijizep.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/35196363215.pdfIn PDF document text
    • http://becucci.it/userfiles/files/92955253255.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/nitezuwezurulejoferib.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/furatanusatitexarup.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/79825683991.pdfIn PDF document text
    • http://12shio5.com/contents/files/nedojaxosigarafefez.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/texalumij.pdfIn PDF document text
    • http://all-premium.com/user_file/files/16916940304.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/sefuzumodaxokobodos.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/68184409902.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/26757684774.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/sojefoganewuzal.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/20704382999.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109160846297772.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/gevujabudofamomi.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/67737561610.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109192055517127.pdfIn PDF document text
    • http://decorstore.eu/upload/file/jelinikekokowabaw.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b71ab2dca9---rizisobo.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/tatapegatazomekik.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/22268707744.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://optikametuje.cz/userfiles/file/5819632570.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_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 10248 bytes
SHA-256: 05911f0e21a8e5ae306f97b2ce3cce06ee687fc0847b4c30df669829bd9e19ae
font_01_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 17344 bytes
SHA-256: 225eab7f3fa4796704ee1ea467bbe72b4c011a1db6ce94a89507c59b51009422