Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e5109ba383fdfd…

MALICIOUS

PDF

94.9 KB Created: 2021-09-12 00:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 813a961f9425d3ac1510aaf298f2aba3 SHA-1: 66a27aa895171c8fd6989ce2a0929a9e92d39dc6 SHA-256: 99e5109ba383fdfd0b2d4beaa711816470296e19dd3bb4a85487a846f8b9fd4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=super+mario+64+free+download+pc
    • http://dlastudenta.org/Upload/file/92126475507.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/22978528489.pdf
    • http://ctm.it/userfiles/file/9684128895.pdf
    • https://dynasty888.com/image/files/20210905_132933.pdf
    • https://tahitotfalu.hu/ckfinder/userfiles/files/37761498057.pdf
    • https://0286869143.com/editor_images/files/93080103439.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/vamuxazu.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bafe55eece713ed6c4363da66bc55e27/guvedetewilozaranudanug.pdf
    • http://nhasachthunam.com/upload/files/xesurowiruwediga.pdf
    • http://yasaitogo.com/uploads/files/74281600252.pdf
    • https://quangcaowebsite.vn/uploads/files/sizovagifimaxesudud.pdf
    • https://dollarplus98.com/images/upload/files/3298326912.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/dadosi.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/20808502483.pdf
    • https://ku4ysk-9lgp4y.com/contents/files/38551477576.pdf
    • http://www.insight-assessment.com/ckfinder/userfiles/files/wovurore.pdf
    • http://classiccar-jp.com/js/upload/files/28855983966.pdf
    • https://namratalakhotia.com/userfiles/files/30290952746.pdf
    • https://iuoshili.com/upload/users/files/nujakifuwewaluko.pdf
    • http://urgentcarepb.net/userfiles/file/41495436184.pdf
    • https://kligi.viart.lt/ckfinder/userfiles/files/puzimu.pdf
    • http://lltsg.com/uploadfile/file///2021091205242615.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_off00010fe1.bin
bdeacc152f90a382170e791688ee99ff57df8481674a1b1087098c583c49308e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 11020 bytes
font_01_sfnt_off00012992.bin
ec93714118716106af6586cf0d6f375533f2c0e11cf4fc02818ff8d91b74a863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 17292 bytes
font_02_sfnt_off0001560a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1560A 16792 bytes

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