Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6820dcd9c29498…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 14:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5bb2e1ffe1232eeb499e2bbfcbe3a020 SHA-1: 771830bafe16d8162ed94b5bf36b04482f1f0dae SHA-256: 2b6820dcd9c29498cb8f718d84628d30794f28dcc969e2863053474be60293e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. 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 redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+trim+a+voice+recording+on+android PDF link annotation
    • http://modern-pro.ru/files/file/gagewurafolalun.pdfIn PDF document text
    • http://philboyd.com/9715066332.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/tuxovavaxijemo.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/52204068456.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/vekumorukokikafagimafodi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48765767748.pdfIn PDF document text
    • https://funbugs.ie/files/file/69199194447.pdfIn PDF document text
    • https://ms01bet.net/contents/files/puvosovutanij.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/xisilizaxivexasatodew.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/56157225328.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/narugigafanef.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/86229288173.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/67444224813.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/tabivusemosegodot.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/28842763221.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/sekesolafemo.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/rarobiferisasog.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/51874278126.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/807vrq1vpad5d7f6o05660saf6/33463941268.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jutitowim.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/poxumaluzaka.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/94864957998.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613205544b7a9---gajijujuwelad.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/12501788695.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_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 10644 bytes
SHA-256: e7d728a0142b9e2755387f594b4d56b565320be765da6c7350a561783cc8da72
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 17152 bytes
SHA-256: d955f5c44f83074d1b0859f2fa079afb2cbbe054d48b1d0d5a029210bd108a84
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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