Malicious PDF — malware analysis report

Static analysis result for SHA-256 023a5b8c84139020…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 18:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9231512465ee94598332a5d5babdb45 SHA-1: 22d6d0064c81a114fae74eba3583f40ffe3baace SHA-256: 023a5b8c84139020b2cb9fd32712b0021b2be1dbb161828a88a0b2cf3ae1ac8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.anaja-inter.org/public/file/67939944135.pdf In PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/noxozalademaxatotukafak.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7eb70a3c0---82076201678.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2eae749db---ruxezuliwinatujolipapedip.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/mitavovepeluwapek.pdfIn PDF document text
    • https://hoavily.com/uploads/files/xaganolekanusisi.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/15842153190.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/60943163448.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/43069828477.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/63290698660.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/66914543558.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/xaraxajot.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/barofedofipudekedox.pdfIn PDF document text
    • https://cicimanis.com/contents/files/niburasidatoxidevo.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/60262907312.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/99095081810.pdfIn PDF document text
    • https://melz-feu.ru/upload/78626932462.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/badarebup.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/91212896576.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210908175143_iuwlif.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/wofuzeguzusepixerejof.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/76384237036.pdfIn PDF document text
    • https://solturism.ro/images/file/tutet.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40439110391.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/75813936880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fingerprint+lock+in+redmi+9iPDF 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_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10764 bytes
SHA-256: 3d6bfca5958f093cfebbd3873fe247e8fbfcd36922639daac662728a9cb8ae17
font_02_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 17532 bytes
SHA-256: 52dc1f3d980e8a85d117ec22cdb330ce76ecbf863cf6ebb61ffc79a11d6996e0

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