Malicious PDF — malware analysis report

Static analysis result for SHA-256 0120bc1ef9deb125…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 21:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac74746a00f789d77e6257028462c584 SHA-1: bb44f39cbdbf0a3608228064c4ca40c55b7077b4 SHA-256: 0120bc1ef9deb12524fee73e61e253792fa9dd4503131ac74f071665e81ec009
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=reallifecam+plugin+android PDF link annotation
    • http://tasarimak.com/ckfinder/userfiles/files/xiwafirilul.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/pabasiserifin.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/15211805088.pdfIn PDF document text
    • http://scantech3d.com/files/witekuginuvelelelito.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/sakizuluzidiwavakejit.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1025086718614da46483fa0.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091321475873499.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/judisamemanoves.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/jibiwif.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/70339373788.pdfIn PDF document text
    • https://pepsima.biz/files/file/33903894611.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/kibamudefipefu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b68bae7d---42142335765.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/7671020144.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/86734074143.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/wekotodarisuvovomiwamol.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/11979641565.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/limirevisapa.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/zupaboxopoziferejawuderir.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/maboxojavitotifuzumo.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/86418900898.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/48176132021.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/sufoxopuxorud.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_off0000b0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 18432 bytes
SHA-256: fd31b4a2812eb94fb9bd77e5621b2bc2ca6f7c950e094c6b5111466fd08bc5ab
font_01_sfnt_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 10840 bytes
SHA-256: 8056c37cb1aeb6d3df913642371c0a115112b9f7eb1573ac6cb0de3c45dba4b7
font_02_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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