Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a5c17e7611f45d…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 09:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8c06bfe65e3878e3bfe89abf185ebcb1 SHA-1: 8f70070d782086e70cc25fa9abd358048dbbb55d SHA-256: 33a5c17e7611f45d259bb7ee7081b53d9f372c08eb4288ae6cfcc3294d9b9aa1
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fkjz.cn/upload/files/2021/09/202109050716189489.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/58dcc7e4f2e1f73fc10b0cbc4486c5fb/dixefenofelomibo.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/donalotawuv.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/21969816906.pdfIn PDF document text
    • https://rajaunited.com/contents/files/41060602388.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/53981114109.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/sawufosimalubogozixine.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/33309591775.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/17394819560.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/jovenido.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b833bf8cb2d38abb19816bb67c390f55/22642065409.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/62720603809.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kaposidizasix.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/zewalerametexubavovulosax.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/kalusipivowaxosawot.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50217221200.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/28559413189.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/21055495772.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/fiwibuzolakasoluri.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/lapafuxi.pdfIn PDF document text
    • http://hasyo.net/files/file/21409884285.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/2152430731.pdfIn PDF document text
    • https://efnnma.org/files/file/12932747890.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/sewejotafesajawudopepemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=suicide+squad+game+apkPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD29 10800 bytes
SHA-256: 09c5e810a6a0c7e76ede2323130ece76fcbc92c8f30595b1b6b0d4f9aaa210d1
font_01_sfnt_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 18956 bytes
SHA-256: 9a4e4e53a09a8d7c0e7cef5785c1d8d7e81f5983bd1ea99f8d8c4ac374c5e5ba

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