Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cfedcb6513ddd4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 18:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71b31f8b79e626e027fe80c3cfd6a023 SHA-1: a84c0d842424fc4d83a039e9074eb5d285480d8e SHA-256: 17cfedcb6513ddd442ccdf88c17299fb0d1bb26a7a87a32323f81d754e439ab8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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 http://partnercable.com/files/bojadalexonumefegaxiguw.pdf In PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/76005634006.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/filoga.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/makadi.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/59216407064.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138970856688---23064066497.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/85839569517.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090912304992.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/69644010334.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/28492896668.pdfIn PDF document text
    • http://scro.ru/pic/file/sikisis.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/42745081954.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131caa4509ec---11138192342.pdfIn PDF document text
    • https://bloomeng.com/uploads/julusalap.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/75337798773.pdfIn PDF document text
    • http://twilaw.com/files/files/20895204717.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/80036356360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+clock+fontPDF 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_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 10080 bytes
SHA-256: b052cc4d37c12eb0ef709d6641f41f7153223978f123156f692e684d7866c149
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 18512 bytes
SHA-256: 60347cfdf3f88e85929979b4818fb30a379974941c76aef5791478640422058e

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