Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d91af4a24c0014…

MALICIOUS

PDF

79.3 KB Created: 2021-10-10 11:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6626fea11f0d0c8c2f5b85e4482da74d SHA-1: 6b1ad45b32bce6c3e123b84c2f1a1df216015966 SHA-256: 99d91af4a24c00141b2ca82fb7dc8e6f89af0532acf1a146ff4492473e374ec3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=blank+out+information+on+pdf PDF link annotation
    • http://tlumacz-bialystok.pl/pliki/file/nagatukipamojar.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/mizufap.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/doxovo.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/58943039720.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/95866762980.pdfIn PDF document text
    • http://falconltd.pl/cache/file/88589208761.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/82828382264.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/52674327561.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/80627918318.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130496aa1ebc---64970828211.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192172681895.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/purisudonogorepivozafes.pdfIn PDF document text
    • http://grotech.in/userfiles/file/9857941313.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/wewun.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/18659561954.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021100915560495.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/thrvnp2hab5i95tidpi2b5gp1g/94053532697.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/95922719793.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/dixut.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/gowadodadej.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/90271627791.pdfIn PDF document text
    • http://p-energo.ru/content/file/fupopube.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_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 10604 bytes
SHA-256: 05436bfb18ae4d21ad105a8309533016956012658db71cddf9ceabf341174e5e
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 17856 bytes
SHA-256: c17342a91b94b7fd7ced2e1c3c6686528d40d010eaf2f9a11de99808de16a8e2

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