Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf075770dd727e8…

MALICIOUS

PDF

88.9 KB Created: 2021-09-28 04:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9f09b22476ee9013a2fa50471a56d8cb SHA-1: 0b83edaef164e0741508ce18d048de4b4b0d50be SHA-256: fcf075770dd727e85c7c7980225193703cd8dbe0db86907ec7e9f765c4d18dbf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nycsmindia.org/ckfinder/userfiles/files/18387751841.pdf In PDF document text
    • https://yensaovinastar.com/media/files/79523907259.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109260147562258.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/pinukitoluniwuxevo.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/rupanagagotuvixusabirumeg.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/79346542804.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/62274627326.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/zivolul.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/67278485949.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9bc1dd7c---29065728156.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/71969266080.pdfIn PDF document text
    • http://xtra360.net/campannas/file/mopikanepokeriwexikilaf.pdfIn PDF document text
    • https://kalafiber.com/webroot/js/ckfinder/userfiles/files/41828786555.pdfIn PDF document text
    • http://zeci.nl/im/image/vobigadopaxaxexib.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/sarapofisomelave.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/h67lgvhj78vq80lsdu8rf526hc/93929293099.pdfIn PDF document text
    • https://thehouseproduction.net/file/31576466627.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/veroruxitas.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/lojudebefawujugufase.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/64415026116.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/riwum.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/61879630178.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109131002342690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sukhmani+sahib+full+pathPDF 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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 21312 bytes
SHA-256: 7b615a02ef97f7a523f8c0ced363a2a23d828738f72d4e46fa3116116dd59086
font_01_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 10680 bytes
SHA-256: cddcfe7b8b18ec5d27e0df531fcc2eb5345b87aadc75c5c4f3ec625dbe3914f7
font_02_sfnt_off00013e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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