Malicious PDF — malware analysis report

Static analysis result for SHA-256 5890be6e9eb3b756…

MALICIOUS

PDF

74.2 KB Created: 2021-09-28 23:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e24d68964c744087dc763d7d424acadf SHA-1: 5ec71c8803626b8d69f9f764751e8ba4e62f3f71 SHA-256: 5890be6e9eb3b756bd5c53691eefc2bdc344d9105ca103a13e1e08dcde20add5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct links on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection names point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://holzbau-napetschnig.at/wirojarova.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/roloveviperelelibasadi.pdf
    • http://waetsukai.jp/system/ckfinder/userfiles/files/saderokozo.pdf
    • https://strefaokazji.pl/uploaded/file/67857762714.pdf
    • http://lagerunda.it/public/upload/file/xalinodovirorekazuji.pdf
    • http://phukiendoxe.com/media/ftp/file/xovixigapewutebaxebotaxev.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/bimupitapigagij.pdf
    • http://mcdanielz.eu/files/file/kigebipegazijezexamolitip.pdf
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/23963283306.pdf
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/99928971121.pdf
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/47128210962.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614009d69a5a7---65959861516.pdf
    • http://soyaksiesta3.com/userfiles/file/zisakotufusewuwo.pdf
    • https://bhavanarayanaswamy.org/userfiles/file/mudopifefegavut.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/19010243323.pdf
    • https://halkum.rs/files/sogutulegebipu.pdf
    • https://ferest.ro/imagini_ws/5232917556.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161512b14ed071---37047498119.pdf
    • http://trevorhannant.com/91054041758.pdf
    • http://ermolino.mebel18.com/uploads/files/63587435238.pdf
    • http://kag.fr/userfiles/file/puruje.pdf
    • http://slesnick.net/userfiles/files/61293813868.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=free+tethering+app
    • https://lapdonline.org/file/76174936417.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_off0000bc45.bin
4f4ec7749b2ae772416d29be39259680841cdd593f89b6a1c1f988338eb98f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 10176 bytes
font_01_sfnt_off0000d2f0.bin
fbfbbbe23c7d9867384ab73d59562ec1b4f7a790601522bcc04b83a10e3909c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 18916 bytes
font_02_sfnt_off00010375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 16792 bytes

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