Malicious PDF — malware analysis report

Static analysis result for SHA-256 8689e005b16a098e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 14:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9acc81be6d31a7f4b9cb055dd4846731 SHA-1: a84a09c2c5e917ffd57f1c975f068b0ee03424b7 SHA-256: 8689e005b16a098ecd2b4ebe9177e706cb6832010ca3c4c47ffc555f63a1ef03
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dreamsurgerycn.com/ckupload/files/rokarusoniwisuvixute.pdf In PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/50483039590.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/63348391112.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/85979995388.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/junabivi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fbb765eea---61297914451.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/50106595783.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/pozupopaxilazurokibelepo.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/nilekirozivuta.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef8f348bc6---wowekesogat.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/kanodenowatapimegu.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/vututinivegike.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/89217426368.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/luwajo.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/jasategupadukobafufugil.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/jisarosoxobetixubaninujij.pdfIn PDF document text
    • https://bak.vn/upload/files/21588535481.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/60345342450.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/94309128625.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/fofuxax.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210916215913094388ri4o7z.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/19899552077.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/walibape.pdfIn PDF document text
    • https://mihalex.by/files/files/46896417722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+avengers+watch+online+freePDF link annotation
    • 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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 17628 bytes
SHA-256: 3c3fdb6e9adc27542d3a3c4f68e2bb4daf0462c5f3b6654d47353febbc1bbded
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10732 bytes
SHA-256: 16374dbeb19cc11bacbd834cef46e99d7d89cc043a01323381286559bdbf44dd
font_02_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1