Malicious PDF — malware analysis report

Static analysis result for SHA-256 febb59c5b2c5165b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 16:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f823f7707d5587dc1390e07087e3ed34 SHA-1: 22e73cb79b32c065587dc7358825399d99dce658 SHA-256: febb59c5b2c5165be71f40b52572d6db33cfb15769c54051e51c5819de3c2d93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The presence of external URIs and the overall structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ppkh.net/userfiles/file/begasuzomolom.pdf In PDF document text
    • http://upnbkk.com/file_media/file_image/file/82805499012.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/20423137604.pdfIn PDF document text
    • http://goldmustang.com/files/files/61694298489.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b1n9vq0g4066s0vt8tj93g0i7u/57319607536.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/tisoxexumezew.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/morawijapokopimevokijom.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/29150462338.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vupelizixibaf.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jiwenomuxi.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/31324947446.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/futenag.pdfIn PDF document text
    • http://stl-hk.net/userfiles/8203814849.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/13596908256.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/020146087349.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100946424648.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/34675357334.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/bijuxijeg.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zugokafalogererobovodepij.pdfIn PDF document text
    • http://hmed.vn/upload/files/33320462305.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/75885452778.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/15919828294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=run+3+unblocked+games+77PDF link annotation
    • 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_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 17756 bytes
SHA-256: 78d0d504da45b7f8eed08cd33ada0dd431a6067a3287c71c0eb339b6f0eed141
font_02_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 11024 bytes
SHA-256: 9f6e2cc5c7362639fdec8bbef3c425dae64528b66f98a2abccf33df3e195b360

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