Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea4c844fa157e72…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 15:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f02691c2ad9cd69a3a40c1d11482b4e SHA-1: 677be767e1da67a554b8ca74b4ecdf741de35997 SHA-256: 5ea4c844fa157e7212eb442607a4bc26f6fc87d485336fc5d597650c03e95c1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was delivered as an attachment (T1566.001).

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 http://circolonauticofavignana.it/userfiles/files/zadowelabefe.pdf In PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/5389197732.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nones.pdfIn PDF document text
    • http://vo23.ru/upload/file/10830758495.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/jusibugedopinuxuduga.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/pitakidujomuzunis.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/wigujegabudolob.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/vapot.pdfIn PDF document text
    • http://netflor.pl/upload/File/31852038640.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/mibapelosubupekolemezep.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/11506294733.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///61594738674.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/dewekaxerererotesepifoban.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/remutuwop.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/zekevapuwinuloxi.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/nuvurivodedegubotokujiluz.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/9172272334.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/pafavidoti.pdfIn PDF document text
    • http://maulich.vn/attachment/files/11148949602.pdfIn PDF document text
    • http://hanleyresources.com/images/59140127764.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133c035723a4---xodegewiluvivafasenuk.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/16121166179.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/79234374888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+remove+a+filter+from+a+photo+on+snapchatPDF link annotation
    • 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_off0000bc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2F 10888 bytes
SHA-256: 8ca00e698571f9296f1f0742879f33925c540fb0f41e51da88fe40dca01d5659
font_01_sfnt_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 17340 bytes
SHA-256: 94a5de2d59e26a7ddbf4697470a59291b16705f71e007a940d2ee2d7dd0fdc99
font_02_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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