Malicious PDF — malware analysis report

Static analysis result for SHA-256 945d26ac6db7364e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 14:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9112ce6c2e643b825b092aa007e6b46 SHA-1: 7245289fae5c66afb11bf7b4cac0a114aca75622 SHA-256: 945d26ac6db7364e83ce9beb920e25a7f9f91607f8d267a1ff4b0e544ee836d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

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 https://crewmak.ru/uplcv?utm_term=zanti+mobile+penetration+testing+tool
    • http://zartmobilia.com/userfiles/file/20210902025753.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/89659564881.pdf
    • http://ttccid.com/userfiles/files/76910725711.pdf
    • https://hotelindigha.com/FCKeditor/file/fogimudabifadek.pdf
    • http://elsekmont.eu/userfiles/file/bunaxipapewabojej.pdf
    • http://tonyprins.nl/images/uploads/file/sosutubuku.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zofokikubodifuxetokadudo.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161381baf6155d---fumigodapalitadax.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9dab8d37d40105065b4ecf3b2953715a/16981030309.pdf
    • http://jinistudy.com/_UploadFile/Images/file/fedovojowulojotanav.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/21465760378.pdf
    • https://derechosenred.org/aym_image/files/13705441519.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/96078671634.pdf
    • http://superlitefan.com/uploads/files/luril.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/rumifokomebomuso.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/47594904291.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/wusopuredasojerozinedu.pdf
    • http://kargo-box.com/uploads/files/52885468378.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/sifiwa.pdf
    • http://geodeslaboratori.eu/userfiles/files/18698620592.pdf
    • https://s-serviss.lv/userfiles/file/kirukan.pdf
    • http://zenkatsu.dk/files/80934451960.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db97.bin
e27f6a7c3c1842878eb6239a3aacb96cc507b9c63131d0cf06d0b4eaa59d5a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 10700 bytes
font_01_sfnt_off0000f3ec.bin
336ba6091586edeb346a06540501c69c07fa2e80923a6424685ac8b7f57d7918		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 17764 bytes
font_02_sfnt_off000121c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 16792 bytes

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