Malicious PDF — malware analysis report

Static analysis result for SHA-256 257b7974cf90df84…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 18:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6fbecceb0b22558bcc95330221a6309e SHA-1: a0259cf5d699565b1d2cdd27d0a0582cc50a4fa1 SHA-256: 257b7974cf90df84bf094786a6301d7c8bb7f756bd5e6281d8aa16fad0f48da1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nsfeed.com/_UploadFile/Images/file/silajilazagaramuref.pdf In PDF document text
    • http://canadianrockies.ca/files/file/napulixomitotuno.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/jamaxem.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/gadikazukese.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/nekalabaxorotavovivepexal.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210905062016.pdfIn PDF document text
    • http://venkateshservices.com/uploads/23804849127.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sopagazavexuxitoti.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7bd8f03aed5a44899ed2c266b7e2f0d0/wopokexufatofosedeve.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zisezixolurut.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/61569851355.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/pubuzogavitox.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/51917353081.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/4963906326.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/diwoboluxeleronuxixage.pdfIn PDF document text
    • http://lejonhund.com/upload/33313320379.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/07/xesofaniguxujumijababokus.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/ritatesudamaxakeganife.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397b4b4a56a---ramone.pdfIn PDF document text
    • http://lex.tj/img/file/93553289119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=live+tiles+androidPDF 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_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 17508 bytes
SHA-256: d1c006ea95910020d32418f232919b5e606bc69314648739fa7e1e9b09a35bc2
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 10264 bytes
SHA-256: d0fc7f34f82e3ac10bd8b85b7441d05e6504b2164ff531b53f32d06d6b043ca7

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