Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d331bedd9216386…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 07:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 426080c66e7239505d1c2cb002b31aca SHA-1: 18e0df9f6c99c6a852eab014b7586c8fea5eefd2 SHA-256: 3d331bedd92163860c98f3001697c748d126836bdd77bf03942a82f249db641d
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 0.9981

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://trunglam.vn/uploads/userfiles/file/6529792125.pdf In PDF document text
    • http://harnettcountyhba.com/userfiles/file/32410689353.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/28255095762.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/28687182845.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///73263371779.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/darubuk.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/87991311807.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/57454184799.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/58685232359.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/97992802051.pdfIn PDF document text
    • https://korankertas.com/contents/files/15182588294.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/57547561091.pdfIn PDF document text
    • http://123dvere.sk/files/file/mepekomofufus.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/damarepusomasejusilip.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/digun.pdfIn PDF document text
    • https://kaimano.it/file/1556264059.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/vuvunapusezamuvajakari.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11158379685.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/togamuraluvovazadadagewu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac776c898---37076659073.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/texijubegosirewasu.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/datureruzugol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=3d+shooter+android+gamesPDF 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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10724 bytes
SHA-256: 9838b07e7298a3c2ead6a1a5eca767a1cae42f09fb28f81ab6ff937640cfedf6
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 17464 bytes
SHA-256: b70549e97b4a5bc887ac3871f882b8a9aee37c4636252c816f02d033651ddde3
font_02_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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