Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be923f080341dc0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 20:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc2d1046237a0b9b60658e68062078e9 SHA-1: c78aadb5060ab04d34bb8f9c8b178b94773e7a3a SHA-256: 9be923f080341dc01bee23b184e5ffa3840f3974ceda29fb32dea8691741848d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is being leveraged to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://philabc.ru/uplcv?utm_term=manifestations+of+paranoid+personality+disorder PDF link annotation
    • https://mebelihome.ru/upload_picture/jugojogugiwi.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/36956504707.pdfIn PDF document text
    • http://becucci.it/userfiles/files/zekamadumidaxoxu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161381815a50f0---dujemap.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/86894351087.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/nekubowoxupag.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/98758926052.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/riferuxesisesire.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/jijiwevegesufan.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/xanabokufijumexazobat.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/febotipivokukadejejenases.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/nusodisuka.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/66637417008.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/40578818701.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/99620560028.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/40804303306.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/79694878389.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/zowefilikuvemol.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/fopituvomanigaju.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143116b239e8---64512032683.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/bigopomuwu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/tarodazidage.pdfIn PDF document text
    • 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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 10600 bytes
SHA-256: 4e2d6a5dedee6b1ee25b55afc632971b598e743b5b6c6c5889a5a698d04e5fab
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 17756 bytes
SHA-256: 02aa0e484df4c71956a983f5fcc732e15d046a0cc778b9bbc782a82b11860eef

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