Malicious PDF — malware analysis report

Static analysis result for SHA-256 8679e80a215e62c3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 01:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef529b68a9291bb375bfd2af5528798b SHA-1: 73e2e0e2a62cef2bb9697b1621532bb17fa39734 SHA-256: 8679e80a215e62c3bc511e3fc48dc0f46c6aa8fd4a2c513aa83b1ba2d91bd519
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are indicative of a malicious document, likely intended to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tutaylamhet.com/storage/ckfinder/files/66662746363.pdf In PDF document text
    • https://canevastoilestjean.com/upload/editor/file/dikuro.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/mazegidabufabonisima.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c63d91d0---51439115043.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/62569263799.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/tilojuxaxotofegisog.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630623819.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/jibekogekozuko.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/31793479495.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130218c03753---dasisilaronozosovamivoxes.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/virabiraponogadakos.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/58517295071.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/80496484571.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/48638927444.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/45356833535.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/73672984939.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/ritixodekukume.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/mukubapijilonularagim.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/99073771763.pdfIn PDF document text
    • http://dsagco.com/Upload/file/noberokalanililapoxe.pdfIn PDF document text
    • http://intertribo.sk/files/siturodukelirisalifo.pdfIn PDF document text
    • http://hk-keber.de/images/file/49572146547.pdfIn PDF document text
    • http://www.agot.pl/upload/file/siduket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+action+mobile+games+2020PDF 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_off0000d7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BB 17528 bytes
SHA-256: 3c28ed7a710000e7a7f578bc1674a517a6cd5ca87dadf3e0e6b29bf37fc66fe1
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 10908 bytes
SHA-256: 98727b95e31aea1159c7f7a19fbf0f2c0794338a28e19ad13f462dcf440d0df1
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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