Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41dfdb5814be581…

MALICIOUS

PDF

77.0 KB Created: 2021-10-02 21:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a90b5368c2911334888cc4e294b342a SHA-1: 43a66132baec039c8325ad1ff86f6880f1d1ddbe SHA-256: a41dfdb5814be5817291dc8933ac0d0faad958e0562a3033e60184af20a08e69
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of linking to many distinct, potentially malicious or spammy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bagumul.com/file_upload/spaw_upload/file/20210913193034.pdf
    • http://alemotta.com/resources/original/file/55691681854.pdf
    • https://ms01bet.net/contents/files/47881208641.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lomuzamipebejonobuna.pdf
    • https://ms01bet.com/contents/files/putikita.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/2598931137.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/kujefasekubepukun.pdf
    • https://geneolock.com/ckfinder/userfiles/files/79699602940.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/76333637047.pdf
    • https://franchiseharbor.com/files/files/jonetawiwut.pdf
    • https://coluer.ir/documents/file/fosagurekudikobufijeze.pdf
    • https://anctools.com/ckfinder/userfiles/files/78667860010.pdf
    • https://ktmcollege.org/public_html/userfiles/file/deruwusizogigunowunubuz.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/xejetulanuwopokalani.pdf
    • https://indicaperu.com/userfiles/file/ketorexikesosuzezujev.pdf
    • http://dailyxedayhang.com/userfiles/files/mejimilokewibijasal.pdf
    • http://savalis.ru/userfiles/file/46899394959.pdf
    • http://limuzine.md/userfiles/file/44399038264.pdf
    • http://daeryuhealthcare.com/ckupload/files/92115812845.pdf
    • http://alimentosldm.com/userfiles/file/xisupewifamumoli.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b440fcb269daa803b2464e57cb6d6b51/67073951291.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/zitigom.pdf
    • http://diencongnghiepvohoang.com/uploads/files/93305194523.pdf
    • http://businessvaluationapp.com/fck_files/file/9017662324.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=new+grammar+with+a+smile+class+5+solutions+pdf+download
    • 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_off0000be18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE18 16792 bytes
font_01_sfnt_off0000d62a.bin
ad274dc12dbfedeba0c9c699e867d97786a50ec1d41c04c24480c46c5b316bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 20112 bytes
font_02_sfnt_off00010b12.bin
b8ea21e335517ccdf3af1b7895566d3921de607fcbfd245f54b71fb0c718ba87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 11364 bytes

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