Malicious PDF — malware analysis report

Static analysis result for SHA-256 217645692a18177d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 02:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 31382229c2daeb826c51bb742e8dd452 SHA-1: 26e7a6afa7d762c4f73f1228a32b757df2f2fc4b SHA-256: 217645692a18177db698077d5ca7196731c04d22ef15db01be57c1b9da68ab2b
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 0.9960

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://jungleflightchiangmai.com/Uploads/files/xolowok.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139300ed9a58---sosopalazofosajimara.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/1102634211.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/fosebunonupeso.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/zobugasulukozenan.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/35752638366.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/rupaposeniv.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/fejamon.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/xumeduxuruxalavososilum.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/68752628638.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/79738797329.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109031247351575.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/55549584627.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613064c8e208b---sujiboxinikoralix.pdfIn PDF document text
    • https://t2sc.me/userfiles/buvokunubemenumusenivowe.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/nurunuxas.pdfIn PDF document text
    • http://okun.su/upload/file/64995886352.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/lizipipu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/14519674374.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/figolifumuwev.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/47638461361.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/gewidojukabusazorurufex.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/vetibuluja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=machine+learning+in+chemistry+pdfPDF 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_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 11052 bytes
SHA-256: 65a6926f5b4fd994feb662fbcfbec0ec1c751ca6d041958abc6c0ab390b94b0f
font_01_sfnt_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 18968 bytes
SHA-256: 05b53b65086cdaff35a58f150f0e838e2333ae818b6263d81c74abfa1d283166

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