Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20471b3710527b4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 11:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e729d41a9fe3f3792a8f5e19e618d5a3 SHA-1: 06cbfb0306f0c193f72cd9a541cde201037363b6 SHA-256: d20471b3710527b4363f90370048ac28d4305e9cf92a86f5c56095afd00c8b1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of a link farm strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://www.depomatrial.com/file/81194514418.pdf In PDF document text
    • http://www.nomorcantikjoss.com/file/63496496421.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34c761e0e---76729049891.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/82370721204.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/bajazokurukupedutak.pdfIn PDF document text
    • https://iohrp.org/f_files/files/sobanulafibesiremukegi.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/14228431766.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/24188361998.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://haciendaloscipreses.cl/upload/file/22600592650.pdfIn PDF document text
    • https://istanajp.com/contents/files/koreger.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/wadogebarijajaminimavupa.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/tajewurerokujuwu.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/nejununedowanuxuj.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/napemasaguj.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/wazupevabetituxemidu.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/sumigufasofejesidak.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/tedafawiduramaru.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/lanujixolalanogafaga.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137017d6da82---64300534231.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/fatosuranose.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/83871192178.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/68091129265.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/somaj.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/17701303656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=calendars+5+androidPDF 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_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 10308 bytes
SHA-256: d973604b693a04c2ffe4efc8b5e65a487d08050ff94d1842ddc7947376875682
font_02_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 18016 bytes
SHA-256: e2b7c1c0b87979766b3fea8e4fe1fef7352f99475968045af537ed0105739ecc

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