Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8839c49bd53677…

MALICIOUS

PDF

68.0 KB Created: 2021-09-12 12:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c15e2ebc650a51a7a45573046481c85 SHA-1: 9f893a019fe817fb0a1be89d17a2b21da772f1de SHA-256: 8d8839c49bd5367750fb2bcd465a21e1fee20178c65261cfd76f766254bc6c1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the overall detection points towards a common PDF-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kiddeefire.com/media/userfiles/files/modape.pdf In PDF document text
    • https://lekkermooi.nl/userfiles/file/18199243759.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/36243564986.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/65629377904.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/nelasotenaxinagijifijux.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/42362244096.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/fevojepejemutexokuxoroko.pdfIn PDF document text
    • http://tencanpowder.com/d/files/serowutaropupivopofofi.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/69846464335.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/tazix.pdfIn PDF document text
    • https://medpressa.ru/files/file/wawelopowibamebulid.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/49669784303.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/51913800837.pdfIn PDF document text
    • http://blgjad.com/upload/files/xojiwuxenozuvaxot.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/49963848998.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/30e96a64822812579830e72620681722/77139155176.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/76375532497.pdfIn PDF document text
    • http://freewest.at/duzur.pdfIn PDF document text
    • http://sns.hu/_user/file/jemos.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bc3385ab---68368988295.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/rolopazefisov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=settings+frp+apkPDF 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_off0000ac53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC53 10536 bytes
SHA-256: 8966c184697ac3348822cc1133499ab22bee6f8bb7ee442922ea63b7d044dec5
font_01_sfnt_off0000c473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC473 14952 bytes
SHA-256: 355eb281a4ad15dab62e6a36dedc78be01368f5113391a691905edb38d12e02d
font_02_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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