Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df778e233cfef95…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 00:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04821d6126dcd3ca20f118d5882e015c SHA-1: 90806dfceec09210c7f85d6c1ff9056f9345eb92 SHA-256: 7df778e233cfef95349f95dec357ed17a82f42ceacbb9504cae1c70c8f6a6814
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to external sites, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates the file's purpose is to distribute links across potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • 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://kindergartenhelden.at/upload/file/73014974028.pdf In PDF document text
    • http://autolubitel-irk.ru/userfiles/file/84347469457.pdfIn PDF document text
    • http://terminsk.by/pics/files/dudinoravo.pdfIn PDF document text
    • http://synhbio.com/upload/files/mokiwekeku.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/33396764263.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/35224178424.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/vixamisolirex.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/44782496513.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/tulele.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/divikadene.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/97400895221.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/tasisumujemaroxirasuwewi.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/xesajobirexebiwidumiwo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16305402782078887044.pdfIn PDF document text
    • http://519pf.com/userfiles/files/74181770354.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/a9db752d3ba891b21fd1b9e75a2f179c/lasaturibudixobowapem.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/86855574326.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/barukifizubafe.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/34735434572.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/70221306187.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/59245549039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=first+aid+usmle+step+2+ck+10th+edition+pdf+downloadPDF 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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 11436 bytes
SHA-256: 1c401a8da218729b8328b9b87e67b58cb3a2b305cd3d26d2e19c586ecb482089
font_02_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 17996 bytes
SHA-256: f94ce3f5cab51b2d4a457fd276c965d914b22d29c2a61d872fd169a4607f3509

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