Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db9a3534352d784…

MALICIOUS

PDF

95.3 KB Created: 2021-09-11 23:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4f4d823de7ce7f5f413262b5328132de SHA-1: 2c48800b98f798bd6a34164314cb2f249ea315d3 SHA-256: 1db9a3534352d7842e23da8ccec58bd00631cbdd36e8af6378e83894be1b79f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://sumosushingrill.com/uploads/files/89941226128.pdf In PDF document text
    • http://infinity-pro.ru/userfiles/file/32188454979.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/19746567062.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/49099139968.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/bomilurarowakidaxega.pdfIn PDF document text
    • https://stormester.no/files/file/lekuxexir.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/6495045729.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/vonelazidani.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137057b4bffc---6057795607.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe2a298fd---mexalofugositulazapav.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/sapalegogikofisuzetuximo.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/giletazimojolomowewane.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/pozemusatevuzolabat.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/metigegalodunutujilaseti.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/rutiritikijoxin.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/nemiduvefas.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/81879320940.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/29492594085.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/mefulavob.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/wuroluvavuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=emotional+intelligence+2.0+pdf+downloadPDF 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_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 19296 bytes
SHA-256: d5d2ff20a497f11e2ce7cc4b051c7e4c2546025c9c5fb373a3727887bebd7d54
font_02_sfnt_off000155de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DE 11072 bytes
SHA-256: e143c6d9c41282ba7dee612ed2294edbbc378da7e8a844615caf25a0a6249888

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