Malicious PDF — malware analysis report

Static analysis result for SHA-256 787ea9d43c67930e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 12:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b5cebab8bc236f5baba2c00f79e2f7d SHA-1: 0c8356be6d137a13a2e6eb74431460820223b902 SHA-256: 787ea9d43c67930e4025ae644e1d023d31a94e82300afa73d7251e0a31868e06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded links pointing to various domains, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the links indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nowyhotelik.pl/userfiles/file/bewuxapunogetexezoti.pdf In PDF document text
    • http://vstarmp.cn/upload/files/20210905_001606.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/janala.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/97309701672.pdfIn PDF document text
    • https://artbynela.com/uploads/file/25747717622.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433a7d8027---55613767192.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/89669175490.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/favatunuzida.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/kemimurenutu.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/71115697774.pdfIn PDF document text
    • http://malifer.hu/upload/file/29417165328.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/79441963614.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/foloxefonufel.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/mavofevirigepexiwumunev.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vakoni.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/66890705884.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/97911290902.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/guwolem.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/69084330779.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/ralanerex.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03693db79---45445058737.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/wufoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=hungry+shark+world+gem+hackPDF 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_off0000b0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 19328 bytes
SHA-256: 99401f2ef731c102fa732b467bcabf711093f4297e73c7ecb679d689bd085342
font_02_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 11008 bytes
SHA-256: 9db15f3adbe6da24d3997837bcb7bd336d593c8b29b04bee9411fa140502613c

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