Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eef4c990df4c652…

MALICIOUS

PDF

68.8 KB Created: 2021-09-30 16:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da9d69e1b80a41c2acb9aea1b4951f02 SHA-1: 0bec3ca26c90104d6287feda39178ddded42bb1e SHA-256: 9eef4c990df4c65258d9b8cba8c6cf13e5541eed935079011c8fc273e48a2b41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and acting as link farms, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://synerhu.ru/uplcv?utm_term=vegeta+live+wallpaper+pc PDF link annotation
    • http://grafiport.com/userfiles/file/kidufutitogigunupawapo.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/pupuje.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/96365718838.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/mikun.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/wunizexunu.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/78542411915.pdfIn PDF document text
    • http://art-ball.net/files/file/1768361855.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/zisexiliti.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/33186388596.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/tuburovizakoraxapixux.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/bakonilejot.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/86047564763.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/69288442894.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161495ab8e918c---fimeveremotagikusis.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/00cefe8c9cc1e5b86e74bb2c4d20a42d/fuladolijedijeluw.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/71218698240.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/lelixudulonimijokuna.pdfIn PDF document text
    • http://sbairs.com/datas/files/29734906060.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/34170005165.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/konujubasuru.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/2680034932.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/nalebejogixefojaxod.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/tegixevibokivosovapa.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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 15168 bytes
SHA-256: c9a056f14dbe13fd97b6cf5084da5eb27f06b8b9c08570cd68643588ce841dc9
font_02_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 10280 bytes
SHA-256: bcc00752d8310e3e711995749fa95b629000f03390b4f1f1dc39738ed8a869a4

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