Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae9f3a6698c7d2d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 14:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25f4f3a568c4327241ddaf009d8733dc SHA-1: f4582ca90efdac14bee11ad236efba8577fa5126 SHA-256: 4ae9f3a6698c7d2d8bec60c0cdad771c610897c3184884b00d48383785547b00
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are unknown or potentially disposable. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.omt.ntou.edu.tw/ckfinder/userfiles/files/kajuta.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff5ea9c45---18232753143.pdf
    • http://abpjseah.news-read.com/upload/files/27333555013.pdf
    • https://palet-school.com/files/files/66031956314.pdf
    • http://roocenter.ru/upload/file/fatobilagigin.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/78323894094.pdf
    • http://crystal-lamp.ru/uploads/files/zabivimugisifovumeku.pdf
    • http://gemculture.com/userfiles/file/16926967076.pdf
    • http://shriadinathbank.com/uploads/49897806617.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9ac00baf---muzuwawaxopigozebifir.pdf
    • http://micruts.org/userfiles/file/nutevobaresafuwojuf.pdf
    • http://daydreamspin.com/userfiles/file/moxozatajazuzedap.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/kagawefuluvujek.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/47981368225.pdf
    • http://eg-connect.com/uploads/editorfiles/file///98100202214.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/27868718969.pdf
    • http://jr-bang.com/uploadfiles/20210903035127.pdf
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/82913442631.pdf
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/92642838198.pdf
    • http://aloisiquadri.it/userfiles/files/nofemevolutunaxi.pdf
    • http://kientrucsangtrong.com/plus/files/bimanadi.pdf
    • https://razredna-nastava.net/files/21205755375.pdf
    • https://laurallo.com/ckfinder/userfiles/files/nalovosesom.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/zazulanudipemebe.pdf
    • http://kondicionery-himki.ru/upload_picture/file/51311016363.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+story+games+on+android
    • 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_off0000efdf.bin
47c3fa4e919f35746960c6e080dcb4efa1dee3119affd29580d28c1bbbd0922d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 17172 bytes
font_01_sfnt_off00011c30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 16792 bytes
font_02_sfnt_off00013447.bin
448219815e1efe02f85d797212951f2302c86077affcc284a36568a56b2407d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 10712 bytes

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