Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf9c1f7ad96229a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 23:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 392838fc0782432ef7e53c4c68d6d454 SHA-1: 13205cc5382547f468955d2dafed1504c2dc8495 SHA-256: 5bf9c1f7ad96229a22d5561cc575e7671cb4adfee5adeb45a6de321e54a763ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or malware distribution attempt. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=android+landscape+and+portrait+layout+example PDF link annotation
    • http://apisicul.com/userfiles/files/kixarulexakididomujunave.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/38980608015.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/woxivozifurulereso.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/juwededavopuje.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/gaxinelitexox.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/ritegizuxijesun.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/xiletofanezazomi.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/92881201748.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/80478820941.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/57704395406.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/mezapaka.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/39152517116.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/59676395881.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134146a0f2f2---35950776978.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/totidadefewajenolagurefum.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/robovit.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/86768162632.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/vobesilulaririwajubinalag.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/jibopulogezuxoteperuselo.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/21359724054.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8255c8d6---rubam.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/2565162196.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_off0000b498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 17344 bytes
SHA-256: 96092b64752a3fa1bfca367285b18aadadb8e6d52f1a8c2d4c644d7c882b3bcc
font_01_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10972 bytes
SHA-256: f59f6b51f4beacdf455654ed743ea0ea34d433b65b633348a1890aca0d40bf46

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