Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c524a822e3c631…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 19:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b147e9cc69fbd41fa1df59193d7c310 SHA-1: 0b7cddec196bc9b0af10209a7ceb65821306b4bc SHA-256: a6c524a822e3c631c5c4e1a97ae23edfc31add127b411d9638e2a7150a0cf9e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, with one heuristic identifying it as a link farm on disposable hosting. The presence of these links suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution.

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 http://kientrucphatloc.com/upload/files/pigoweletozoxuxogiwu.pdf In PDF document text
    • https://o-dance.com/upload/files/fovidixusota.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/lebaliziji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613095236c1a4---48542251739.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/27771563045.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/33428751156.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613226e243aee---dijemo.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/97769849508.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/38117602401.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/xowupanokukij.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/58874637504.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/fatanuxutewefakudoj.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/4705166244.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/a6c4de349b941248fd1ba6ac6b97a3cd.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/12539205992.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/71105832257.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/20886398117.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/43379569993.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/vegixipixotejat.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/dotajulapop.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/gowuwofivefetisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+retrieve+lost+contacts+on+android+phonePDF 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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 10756 bytes
SHA-256: 34046b32ccece8a38e5ca4f491b6620950b78f1a1dac7143dbf7ebe2dbe75df8
font_01_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 17808 bytes
SHA-256: ec5334f2e415c5a22b22e8a344a9dc34a6e3bf9093b084d923160e14b03fdb9d
font_02_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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