Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da29acf86ae76cc…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 01:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb08a44d6d2514704acdbb7c2477f47d SHA-1: 462342fba3d7ac6f0085ffe972889a36a6fe16d3 SHA-256: 8da29acf86ae76cc16cdea7e9d0fb60a44c4ede501857957af1f82a8e4bdf42d
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by an ML classifier and exhibits characteristics of a screenshot lure, containing minimal text and an action trigger. It hosts a large number of distinct external URLs, suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. No scripts were extracted, but the presence of numerous external links indicates an attempt to direct the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://get.belonnanotservice.ga/away?/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe84529e79---14317649571.pdf
    • https://moveo-sport.pl/userfiles/file/63633745701.pdf
    • https://napraforgohotel.hu/upload/file/68876543143.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/dumokufokugi.pdf
    • http://newbiesites.com/userfiles/file/16976486621.pdf
    • http://podhoru.cz/userfiles/file/38892989164.pdf
    • http://www.smwiarus.pl/ckfinder/userfiles/files/36998290398.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a5lovq36pusvtormei9qvd5t96/8990877337.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/15287243806.pdf
    • http://jinyezi.cn/upload/jideruvukefanutinobapog.pdf
    • http://conganbacgiang.vn/app/webroot/uploads/files/vavazuxopavamaridenakew.pdf
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/bawowo.pdf
    • http://gdfsztal.com/uploadfile/files/topinaxaf.pdf
    • https://emartdeko.pl/galeria/file/negubogadija.pdf
    • http://dealershop.es/camarasegovia/userfiles/file/41370519571.pdf
    • http://digifast.cz/userfiles/7088095019.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613331f75ee4a---23879567531.pdf
    • http://rainhouse.kr/data/editor/file/1241042153612ff5e4e3b22.pdf
    • http://computer-rudolstadt.de/upload/file/14718058173.pdf
    • http://orvosvalaszto.hu/uploads/files/wefogonoju.pdf
    • https://telechips.com/ckfinder/userfiles/files/51870229866.pdf
    • https://scavilecis.it/userfiles/file/49056978382.pdf
    • http://futimisdev.com/userfiles/file/fumaduvorozozetelimelel.pdf
    • http://yibetter.com/data/files/14749649598.pdf
    • https://cometsecurity.in/admin/userfiles/file/45759693199.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=wwe+2011+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2e8.bin
af7b38738f73984d0108f3ca59e8ad945cf8268bf872e889d42331ef163cc731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 10392 bytes
font_01_sfnt_off0000caa0.bin
763a72838f08a84dcf907a06b41cf6828745fec9bddf6ef18703ad5e60106708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 14528 bytes
font_02_sfnt_off0000eec6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 16792 bytes

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