Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5c7d9b41bdf504…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 20:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 214274dfb01c83a05408d522b4c7b373 SHA-1: 48948d200a68ed1e5691ea3e08db038cdf9cebb7 SHA-256: 1f5c7d9b41bdf504294308f07241e4cabb9e361b804b62d10ad4088d2086d7de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

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 https://medvor.ru/uplcv?utm_term=best+dj+mixing+apps+for+android
    • https://hatinhjobs.com/upload/files/37487325391.pdf
    • http://decorstore.eu/upload/file/jelaxo.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/40418514650.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/63749866109.pdf
    • http://gyliver.ru/files/files/badafizug.pdf
    • https://perfecthospitals.org/ckfinder/userfiles/files/64138330623.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/23344306880.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/gafiluduxuwutola.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/23202276161.pdf
    • https://ibextrail.com/editor-images/53297831813.pdf
    • http://mientrungland.net/uploads/image/files/bebijamadul.pdf
    • https://prosaison.fr/userfiles/files/wabijibapefawakajuwexefo.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/1391541825.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3da6a4e1ce0eac9c0dcf4068bdc321e/80285256624.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/mugif.pdf
    • http://www.pvvc.cz/files/74537590658.pdf
    • http://allprintusa.com/admin/images/file/zanenenabenovuvu.pdf
    • http://zhjpharm.com/upload/files/deputavuzuwa.pdf
    • https://uat-tunisia.com/userfiles/file/fanomevezuxovod.pdf
    • https://nusbetaja2.com/contents/files/86775655886.pdf
    • http://botosani.ro/img/uploads/file/kiruzuzebupetafujaxabidab.pdf
    • http://thuonghieutoancau.vn/uploads/files/4880744687.pdf
    • https://movimientofamiliadejesus.com/images/uploaded/file/24686518436.pdf
    • https://rizecanreklam.com/images/file/92071354015.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dadb.bin
819877a1045fdcb7c64c58d76be28cd8bc7456543437a56c10d48d33780abbb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 11080 bytes
font_01_sfnt_off0000f47a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 16792 bytes
font_02_sfnt_off00010c8c.bin
7729bbe9b7da94d5331b6316eb3c04e6547b6fa3cb11fa73fac688c2467b0e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 17568 bytes

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