Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82f66f684d300a4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 16:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b505be478e0fa646514a9cea591f36aa SHA-1: f5e96178a485dcd13742a861c1967f50620b135b SHA-256: e82f66f684d300a456f69ab2c2a013dea48b639eabba859edf7d9e83f7ca1906
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to potentially suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to distribute malicious content or phish for information. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://goldia.cz/data/file/74972831923.pdf In PDF document text
    • http://gewald.ru/content/Files/71435378730.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/wiroforox.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomosegik.pdfIn PDF document text
    • http://sushibelovo.ru/files/29915179030.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/53984812928.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/kokodib.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ebuzosawatoduludoremim.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/warogobog.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/67522748901.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/jolatemumumabu.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/73613260754.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/20974752476.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/butisizutigarix.pdfIn PDF document text
    • http://iknow.pl/files/file/37623110125.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/likobitafu.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vidafuzakudader.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/5122557130.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/42017877148.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/nuvazul.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613002c05132c---22291355438.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/95583502252.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tajelepefezobinumaxufunij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hack+insta+account+pcPDF 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_off0000d6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 10272 bytes
SHA-256: 360e5e789cb400d85d68054c10a7a8f628bfc4b80e20d6345480187166907d23
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 19408 bytes
SHA-256: b9707685aa105ca913b66e3536f67b6c328c4061aec912f06bee88cbd1b4ef87
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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