Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81c139015f1e45f…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 18:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ad588c9821d382ec233ed6c8ac18e43 SHA-1: 1e7e0d9a52b622e76afa821fc0c1f05928d1e168 SHA-256: c81c139015f1e45fe6c13a3d19c4575c358090920b4f58ed86cf55fcc16dea2d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. This script is likely responsible for the external URI redirection observed, pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://coretry.ru/uplcv?utm_term=convert+pdf+to+excel+free+no+email PDF link annotation
    • http://tareeapartment.com/user_img/files/64896358198.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/zojuguduzisofutaf.pdfIn PDF document text
    • https://btegypt.com/file/57136986744.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/vibotenufilax.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/rapupibafoto.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1443cd3d5---vurolaje.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/wararewakiw.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/gapurevuxidutudupizir.pdfIn PDF document text
    • http://megalaserasia.com/upload///tujizotezuxen.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/sajibixubupije.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/lawelovesenenugudimoru.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/jemegakubemogejop.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/kaxawifudodekejapiked.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/4348504845.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/84161251566.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/legexet.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/32599500174.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/kuvixazipagupulefumila.pdfIn PDF document text
    • http://haphadoor.com/upload/files/54882775136.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/42627617665.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/dixefi.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/folulale.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/30vj1a46snkbjn4un64hmklqq0/bizaxatasomavabi.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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 10812 bytes
SHA-256: a1768c16e0acfaa29e851aa040963952b26bcbb739220c8033185553662ff21a
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 17896 bytes
SHA-256: b2328d641be83e79bd00f875b51171f40160075d0ffb2620d473efc4d149c0d1
font_02_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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