Malicious PDF — malware analysis report

Static analysis result for SHA-256 7757e8eb6c825f3c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 19:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cacb379de1728ffb0fc5e5091ced1f59 SHA-1: 233f90ee2c5c19b697a5b2094aa4fca7b69d30f7 SHA-256: 7757e8eb6c825f3ceabf87359d36076ab16609b1884c05b8a837e0dc7f9dac3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious actions within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs indicate that this PDF is part of a larger infrastructure designed to host and distribute other malicious files, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abpjse.news-read.com/upload/files/lojorivosixapofomaj.pdf In PDF document text
    • http://saeronbio.com/userData/board/file/21714810894.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/juwikewasixunapofiputom.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/rifulobarupuki.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/30342036091.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/nidupakakamup.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e052378d84---81987644074.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wopixepavuguruzenofa.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/86588631289.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1f9f93bb2eda19ca0ae414bb27f3eb8a/23847352625.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/26318419479.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/36730310521.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/gexifisetezobeto.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/sapumofilemogovarite.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/6212879029.pdfIn PDF document text
    • https://edgecs.com/documents/86104323490.pdfIn PDF document text
    • https://mimpidia.com/contents/files/norepipukobata.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/87285774072.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/37911205146.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/60005408577.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/27378407147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=project+drift+2PDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10240 bytes
SHA-256: 179b499073ef3d63535bb9752e800c7eb9ee25510dfa7b23cbec61815ed755dd
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 18324 bytes
SHA-256: 460110f7fc6290e496ee3e62e46936b5b4cb3e7f4b0dac8e2a120776102299ca
font_02_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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