Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a0355c428f917c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-16 04:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea4f202ff4610d7397968c23c4bf5d92 SHA-1: 5ef7f563a527de12e6e1d943a39359438e6476ca SHA-256: 83a0355c428f917c78409e224a0cf954c7ed8dd5e5afa75b8ed97dce0e3e0351
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm, and multiple unknown URLs were extracted, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://tailormade-sales-marketing.com/userfiles/file/mipemepetetuzejaz.pdf
    • https://equalland.com/uploads/File/69013769540.pdf
    • http://architettoseneca.com/userfiles/files/tazojaro.pdf
    • http://uniradioweb.info/userfiles/file/89943085892.pdf
    • https://konchris.com/userfiles/file/1630621882.pdf
    • https://it-remarketing.pl/app/webroot/media/files/20545383027.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/32539182100.pdf
    • http://samtekelektrik.com/files/jawatudug.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/debudano.pdf
    • http://wxmx.cn/upload/ckimg/files/202109160258065202.pdf
    • https://guapa2.com/admin/fck/file/kixetitukujemutawu.pdf
    • http://gold-carsales.com/js/upload/files/fawevapevixomoboxewak.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9667859990.pdf
    • http://astprom.ru/sites/default/files/file/posirudijebakokef.pdf
    • http://microcement.ua/userfiles/file/kejumolixusideso.pdf
    • http://libertyquad72.fr/userfiles/file/65491742652.pdf
    • http://kaie.org/userfiles/file/20210909001837.pdf
    • http://kimura-shihoshoshi.com/userfiles/file/6759829244.pdf
    • http://jongauger.com/ckfinder/userfiles/files/netidamemibetadomori.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140939711188---xufavovutomapawipujafa.pdf
    • https://777mto.info/contents/files/50253432557.pdf
    • http://startmatbaa.com/userfiles/file/49362282930.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+update+android+studio+emulator
    • 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_off0000c738.bin
118325411391b2e1726e4bbb14f281102e2ec9a3b18868142d2d7480974ba4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC738 10728 bytes
font_01_sfnt_off0000dfd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 16792 bytes
font_02_sfnt_off0000f7e8.bin
f469d68f5c801152b9711950f78609d3f9c6d2a477f83504c67b288921571f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 16776 bytes

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