Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d74f91e3b552f38…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 12:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c5b99111a0190a5eeff8968bfca458b SHA-1: 30221895558647452f118e46e6afa6fec8babf46 SHA-256: 1d74f91e3b552f38927f1e313e68c5e2069d4ada8cf1f11b06da1b185f3aac1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to suspicious domains, and is structured as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to obscure the true malicious intent by distributing links across multiple disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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.roosprommenschenckelfoundation.nl/ckfinder/files/files/munedododaxinizitijuk.pdf In PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/lonamezifiwaroxabuliwuboz.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210913204217.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/fibabalogesoj.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/vuniziwerubev.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf93a083b---jupasexuranera.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb5550b68---15614136894.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/69235542352.pdfIn PDF document text
    • https://kar360.com/resimler/files/taxusub.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/58260738861.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/patuxivadeperen.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/degod.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/42118527444.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wudawexuzobisatavebot.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/86996703136.pdfIn PDF document text
    • http://glassick.com/userfiles/file/dalifunufo.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/61033467234.pdfIn PDF document text
    • http://gibisch.org/files/files/dodedulijipawejoxil.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/zevozukeveraduwipulepix.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/65518537424.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/dedorepu.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/61874153392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fast+and+furious+5+full+movie+putlockerPDF 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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 17960 bytes
SHA-256: 27b30644b05cd0e375075f0b18a5f1ae79f44b2c98b5d36c1f1406bd2743e2b4
font_02_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 11148 bytes
SHA-256: 2a3a4e270de72cc57ba8808847bc8a1d69a81a09530caf655fca639493fbde3b

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