Malicious PDF — malware analysis report

Static analysis result for SHA-256 6476e557b823a2e6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 10:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: bdc10cdadab248fdc174e39817db7f37 SHA-1: 7ed02a871d37e0b25b43d58d81d832cd7b643e6a SHA-256: 6476e557b823a2e66b41982e319be489d0c104bee69eb38a05cc8d9e50e136dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=online+cleaner+for+android PDF link annotation
    • http://skkl.cn/filespath/files/20210902060015.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/roxulalozefugone.pdfIn PDF document text
    • https://halkum.rs/files/11919022783.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/gagukoliko.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908124733.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/69503175243.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/gijesopulerajexalap.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/tazopubunekujugegot.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/10c49d8e933f10e78d061273605a226b/mowetawemuxulomivoralafu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd75dda5be---xilerogufesimubegijurona.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/dudutezupofimikodamok.pdfIn PDF document text
    • http://seto.cz/uploads/94237038885.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/43345157546.pdfIn PDF document text
    • http://sbairs.com/datas/files/jusekebebikotasen.pdfIn PDF document text
    • http://signauction.net/userfiles/file/84211782298.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/24383318138.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/tivifagebizame.pdfIn PDF document text
    • http://teresachild.com/upload/files/tixijakogo.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/zuzusawufuwejawajip.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/57739828576.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/72656298511.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/tifinuz.pdfIn PDF document text
    • http://pololanna.com/user_img/files/jomugimimuva.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_off0000b5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDB 10228 bytes
SHA-256: aafdf8e90804840b790e1e4a560d3fa34d734495b8acb3dcbede03bb23d41572
font_02_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 15800 bytes
SHA-256: 0c03075a480fa9e48dfb7628bc03506a0488565f3ddf46d6467dff335e5697a9

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