Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0373c38358f235…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 07:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2a70c2b141d7364b32c6efdbd246115 SHA-1: 8080b1865900a044cf777ee43d15df24dd20f66c SHA-256: 9a0373c38358f235b7d2c9fac88d9ce0a25ff1b9fcae80d3eeb2b23a6982555c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple unknown URLs indicates potential download or redirection points for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wijnhuis-vaessen.nl/site/data/ws/files/ziguwetesukixemapano.pdf
    • http://palyavalaszto.hu/teszt/upload/file/puketikuregininivaxesa.pdf
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/6844398887.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9228902632.pdf
    • http://dlzhrjd.com/images/uploadfile/files/sesaxajinevokopesane.pdf
    • http://unicorn-furnitures.com/d/files/9933245796.pdf
    • http://naturabliskociebie.pl/userfiles/file/12501077192.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324f1fb3fe8---74122554129.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/38181001166.pdf
    • https://maintogelonline2.com/contents/files/58001796134.pdf
    • http://zeci.nl/im/image/fikobibogupiwozomavepaba.pdf
    • http://itcck.org/upload/editor/file/57709871200.pdf
    • https://soechi.net/userfiles/file/revow.pdf
    • http://rewitex.pl/userfiles/file/67761237600.pdf
    • http://ilkyoukais.com/Images/Media/files/31925667768.pdf
    • http://asirakademi.com/resimler/files/22645981038.pdf
    • https://angelsforwarriors.org/userfiles/files/93386531269.pdf
    • https://manorhair.com/uploads/files/202109120525201676.pdf
    • http://pillshop.ru/uimg/files/28985027506.pdf
    • http://www.urbanwaterways.info/files/30155056806.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/debez.pdf
    • http://bettynblue.com/upload/fck_img/20210908/file/zufiweperexavelu.pdf
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/vuvolejujajonaxovumo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=adb+universal+installer
    • 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_off0000d444.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 16792 bytes
font_01_sfnt_off0000ec5b.bin
4dbfd26a8d4cd94f1e95facb850e357eca4f3eb3c94a33faa6e4a1c6effc07dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 10408 bytes
font_02_sfnt_off00010416.bin
4132204c5e79a58d4dc235c5d0cad6e4a02e14d090b9b83fcff6a7bf00094d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 17676 bytes

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