Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceee48eaba312bb1…

MALICIOUS

PDF

73.7 KB Created: 2021-09-23 09:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdf6035d8d957092a0ee347ffd4cbbb3 SHA-1: 7b5427f2b85508e6409a57214819f88750d47f7c SHA-256: ceee48eaba312bb1792454469c24860dee2955a09fa909671db02e143f24e77a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm on disposable hosting. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware via the deceptive links. The embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or redirect the user.

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://philabc.ru/uplcv?utm_term=windows+7+home+premium+update+to+windows+10
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/lugirubusukanizomitiguf.pdf
    • http://dgjst.com/upfile/file/26231987352.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/segodokubufatov.pdf
    • https://mallarpurnaisuva.org/go/file/48136658232.pdf
    • http://villalapinetafavignana.it/userfiles/files/20478387643.pdf
    • http://ffarchitettura.it/userfiles/files/laveridanubasetiwutagude.pdf
    • http://bctlorraine.org/userfiles/file/94773485735.pdf
    • https://floridainvestment.cz/files/file/jenopezupu.pdf
    • http://antansconstructions.com/ckfinder/userfiles/files/61172183975.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1e0ef988fd04d2e205d4ffeb31c73d5d/pupenelibuso.pdf
    • http://parkingparts.com/Upfiles/file/kagipomuf.pdf
    • http://toanthinh.vn/webroot/img/files/36853748325.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912175627295219.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/vekilubaje.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06935569a---15333710874.pdf
    • http://malifer.hu/upload/file/koguxokodezurirovubewe.pdf
    • http://skkl.cn/filespath/files/20210909050045.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/24345469795.pdf
    • http://pharmorgsyn.com/upload/files/zuvol.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/vikilu.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/16027955011.pdf
    • http://garage-ys.info/js/upload/files/97388565550.pdf
    • http://gccde.com/downloads/blog/geust/files/jusexuxerixapegexaz.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_off0000be05.bin
37d6e4ec88f9804e1bcf19b449a8f687454fc09dd6bde107fd05a7cdda9080b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE05 16108 bytes
font_01_sfnt_off0000e76a.bin
a9e592808046bdfdc62add56d84a6fa88e3d3be881fc7b399750ddca8aeb4e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 11016 bytes
font_02_sfnt_off000100ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 16792 bytes

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