Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6a2b111560ede7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 03:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8569f094bae8917427c6b86fab1b99de SHA-1: 43a9f5b689fe0a0a5be080fc7bd8176f87238c9d SHA-256: 9a6a2b111560ede719c4a9cdf1154f87499b6c75486869d7e8f6500393ca5440
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

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=pixel+3+android+version PDF link annotation
    • https://seeandhearbetter.ie/img/shop/contents/91150406068.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/14709564898.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109140650122298.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/bazelisixudewokaz.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/66663785165.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/vasijig.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/xogumerudenevaligemo.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/32877106674.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/82969016480.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/5255003383.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73885479818.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/wowonixowulif.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/kiwaxurosomasopu.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/mudogejabasadar.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/lagogefexufakel.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/19103594578.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/522521f4bd0eaffaaa91d2e33d34be4f/31293908991.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c217b47aed4d51532cbe7f60fcbf2de0/5147858340.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/nukofufeda.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/dibagagigubonudenap.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/foxixuwerudeganutuvakixo.pdfIn PDF document text
    • http://orderkai.com/uploads/files/pesizuIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC54 18080 bytes
SHA-256: cd1f4d129e05adbbc894b920ce34929f57f6929ab4e73e3501655ffc2e929515
font_01_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 10484 bytes
SHA-256: dac8d63fce9e8b095a902510a60d84ce9c4347fbb046b968b58bde09398fe911

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