Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e55bd32393aca0a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab72f70a63dbac1b84678b23ba777c7e SHA-1: c32191ad00ddb0fd5453e30138d79e9d390665a7 SHA-256: 3e55bd32393aca0a34ac0d35bc0d06240f8772e812d3043ff76c9249225bcb51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.ocptecnology.com/admin/uploaded/fck/file/47814500334.pdf In PDF document text
    • http://barudan.hk/UploadFile/file/20210905073651540.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/85006533913.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/96903757287.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/logunexalimep.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/vogotarapiz.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/1167880598.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/7328007548.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/77655964020.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/vukerarasunitogikas.pdfIn PDF document text
    • http://cwesp.biz/upload/file/36291735103.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613363b90de39---renorofuminisasiz.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/ponapajivejoriwasotadewe.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/varakodutamanar.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/nanilexagag.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381aaaa40c0---50327973723.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/69226830913.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/87219114648.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/39203969398.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/ximamulenete.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210911011107_gja0f2.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/dobekunukilola.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/fosoke.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/55828698802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=layout_weight+programmatically+androidPDF 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_off0000bd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 11080 bytes
SHA-256: ff43f9592699e63a03b9de6d7b5eade0870e1e8e6b561485d896851d8a964baf
font_02_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 15356 bytes
SHA-256: 691d74f3461820544223f6f74a86249bab54d03d5a728c1599092bfd9217f7da

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