Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb780218c7d2e08…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 17:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e52a54f08b41255fde9f4d289b0a24a4 SHA-1: d26bd018bb86d0d972adc37b72a8ae704f25e160 SHA-256: aeb780218c7d2e0851361a98140b6f086fb30edf17ef724c67b9446db1941d6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the ultimate destination. The PDF structure and numerous external links point towards a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=racing+games+apk+free+download
    • http://cn-polylysine.com/d/files/20505260423.pdf
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/gojapakazufajilesarojofi.pdf
    • http://formel1vermietung.de/userfiles/file/80483818954.pdf
    • http://mengnuanua.com/app/webroot/files/files/rovasosuvipefatudiket.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/51527455484.pdf
    • http://serramentisiciliano.it/userfiles/files/xuxisuvinejodaxas.pdf
    • http://www.sun-green.eu/ckfinder/userfiles/files/gedemexoroperejurap.pdf
    • http://tencanpowder.com/d/files/wefogidumufunomeb.pdf
    • http://n2nnetworks.com/files/others/96920270154.pdf
    • http://skontrolsengineering.com/file_media/file_image/file/43762583800.pdf
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/51108078379.pdf
    • http://anais.terminarz.online/kosmetyczka/krakow/files/ziwoxutisiramudufimavenuv.pdf
    • http://hyundainhapkhau.net/upload/files/67646299698.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161373c55a4efd---90460474895.pdf
    • https://path.mn/userfiles/files/49382841035.pdf
    • https://davnosti.ru/upload/nazudorekomebebepamaz.pdf
    • https://nistd.in/userfiles/file/tubonezinusilalok.pdf
    • http://klenderbio.com/upload/files/sozexusog.pdf
    • http://aftp.bg/userfiles/file/posuworibetozunozew.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae79572a6---sexujuzogogizasemubeluko.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/12316850122.pdf
    • http://pluimveebeurs.com/userfiles/file/wujenekifujikujoxexe.pdf
    • 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_off0000e9de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 16792 bytes
font_01_sfnt_off000101f0.bin
2eef7fb270969f6b6099a189da3008c8f4ffc9f35679dbff3bc59cc15350d956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 17912 bytes
font_02_sfnt_off00013032.bin
2714b2dc558b2293cd357a4d46e7845b2ef11d5f5a6cdd2ecec22a4df76da357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 11088 bytes

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