Malicious PDF — malware analysis report

Static analysis result for SHA-256 2512bf60def41f0c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 07:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 57cb429b37903662d99221d7cb98f790 SHA-1: 19e9d9e65f1238fd72976ca07356933a5f872321 SHA-256: 2512bf60def41f0c17c515e2492cfea8dff7a5ab1f60c9f94a31ec5d1ccc19f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://wastran.ru/uplcv?utm_term=how+to+connect+a+nintendo+switch+pro+controller+to+a+phone PDF link annotation
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wadepa.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/wazabemebodozazonofadivup.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/64136938594.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613611c813c55---50241429924.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/lusupexoburolimum.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/wagibu.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/wanupuno.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/37751445956.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/kitelaj.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/98479392265.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/lubexafefuzejor.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/30479332030.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/60233853205.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/numodufulo.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xarejetejefu.pdfIn PDF document text
    • http://rld-carbon.com/file/netijaxixizib.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/51830125588.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/45539745000.pdfIn PDF document text
    • http://usagimatur.com/files/others/fonarafaganavuwumij.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/73760562014.pdfIn PDF document text
    • https://denimder.org/resimler/files/19188494315.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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 17272 bytes
SHA-256: 2aacb657f864928afd66ae75dd414796cc86349c247b9987c52f90726a3b523c
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 10688 bytes
SHA-256: a250f3c7e7c442154864791e2d17e9e88a5db34bcd03a285b3f68cb2e558e2af

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