Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c51d721fdfaf6de…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 15:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d70db1148094bcec3fd9ca5aa5b4a34 SHA-1: da29d0f639cca1da4f41587d0348352d237385fd SHA-256: 9c51d721fdfaf6de0177674cdb4b352c1763a785fca2c6ba0c2514c7e35024f4
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://laborke.ru/uplcv?utm_term=madout+1+big+city+online PDF link annotation
    • https://jamuiboe.com/webroot/upload_media/zobogawofodejikugog.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/kobojevumibepelatiro.pdfIn PDF document text
    • http://stroi-sistema.ru/img/zilin.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/52348568327.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/22171566563.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/94069128349.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/vupebi.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/patirogejivetuxefu.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/8507394669.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/8056201927.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/donebimojelubil.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/67798811434.pdfIn PDF document text
    • http://tfforming.ru/d/files/beladenerofosode.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/96121990351.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/bizoxovamonikepenal.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe31739813---49447784429.pdfIn PDF document text
    • https://heureka-cz.eu/files/56428095213.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/rilonipisumotilepod.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/joxoraretejedi.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/kopafakir.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/xafalomawamefovosa.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/51014334582.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000dc2a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC2A 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000c3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C4 10676 bytes
SHA-256: b3dcd944d65d7faafaa3d39cd0ce33bf1c18b7077334bb680d415e0d61002603
font_02_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 20248 bytes
SHA-256: a1c3acd49c1dca98685a77f1779a36f099e99c6d3eb8341a6f122eb735051c6c