Malicious PDF — malware analysis report

Static analysis result for SHA-256 388561bd46bef5fc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 07:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec24b88c43074f5b3aec284f68813140 SHA-1: 8cf14a837b3aae95a3e75baf00d8a70dd0e31f9a SHA-256: 388561bd46bef5fc5066a5dab4f34f993c0645678e2ad1c9e68f5881b0e38af2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. 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 numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=run+mobile+apps+on+windows+pc+or+mac+with+bluestacks+android
    • http://onlytech-tunisie.com/userfiles/file/limavefadinamaximadireg.pdf
    • http://dichvugiayphep.biz/upload/ck/files/60449030206.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-9-16/20210916222334355529.pdf
    • http://dispensapertutti.com/userfiles/files/noximafijiz.pdf
    • http://www.cavice.fi/tiedostot/files/39163346909.pdf
    • http://startmatbaa.com/userfiles/file/97221217492.pdf
    • http://preprod-proximeo.com/ckfinder/userfiles/files/9630896782.pdf
    • http://3bbb.fr/ckeditor/upload/files/1986939103.pdf
    • http://stonepigments.com/userfiles/file/95535325750.pdf
    • http://eshop-kocicinadeje.cz/files/file/99821271744.pdf
    • http://vinhthuan.com/upload/files/1676159498.pdf
    • https://onutglen.com/caningest/images/file/pozuroxowil.pdf
    • http://abovomedia.hu/_user/file/18270645645.pdf
    • http://serting.eu/userfiles/files/xirarojufepanusotapul.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/21482629987.pdf
    • http://fazekaskozpont.hu/images/upload/file/giponuzizuza.pdf
    • http://enricobarraco.com/files/pidifimilavuba.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8caeec6af---44947358626.pdf
    • http://biurod9.pl/public/userfiles/file/nadosude.pdf
    • https://aljuboori.com/userfiles/files/jenazawezesu.pdf
    • http://cachnhietwin.com/luutru/files/86088712668.pdf
    • http://x-site.by/upload/editor/files/15818377227.pdf
    • http://metabolit-plus.ru/files/file/josibuvek.pdf
    • http://metalzilembo.it/userfiles/files/58061704833.pdf
    • http://parvazyab.net/basefile/api203/files/legafalewuwefepot.pdf
    • http://wernitznigg.at/files/38639232982.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d090.bin
b4662879c6448eb0e92cf71e9c8809681c41a71808c6e2da9faa7afbeabd85fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 17632 bytes
font_01_sfnt_off0000fdfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 16792 bytes
font_02_sfnt_off00011615.bin
69936b1a5745fd7693138dcc578a5cae7ea132fef3d88febd701905bc271ceff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 11240 bytes

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