Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece79617971bca79…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 20:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4a81b8234c6ed9b364024a9be137cb18 SHA-1: 6dd51eca8e776a316c3719e593fd9ed44e1325af SHA-256: ece79617971bca79ac5c0a09e33a431c0d61aba989f70d27fead034841025064
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host a large number of links on disposable domains. The ML classifier and ClamAV detection confirm the malicious nature of the PDF, likely used as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=jetaudio+apk+old+version PDF link annotation
    • https://ywint.com/ckfinder/userfiles/files/1632343960.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/20741504377.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/niletuferefejaxozi.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/26869624538.pdfIn PDF document text
    • http://guitarenko.fr/img/files/wutovazoteduwiner.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/25015979262.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/zepavosajepi.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/marixokosufawixotesi.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/fuvavigizegeji.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/21709913453.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xozemogajizopesod.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168f64f37f---zaroto.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/dofod.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/49360666625.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/woxoxikate.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/56831538685.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/50446654701.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/81278052613.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/35589436287.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/pawiz.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/pizatuwatibowowetod.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/64753726577.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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 10632 bytes
SHA-256: 69fac12871a606eb232dfceb71a18ee8886ad4c76c70b26344785e3378023ad7
font_01_sfnt_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 17704 bytes
SHA-256: ad54e8bdc0949ce423dab03e5453e20ccc5515586cd8458753fb84de48e4ae70
font_02_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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