Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77f9d565d11c7e9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-23 14:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 15b0e9e8b5f9ec5983bb80cdf0d41f79 SHA-1: c68d465bab3ee4ed8d68da79aae481baf8353919 SHA-256: c77f9d565d11c7e9c200e60ed89d449c751bbe4a92be806f7018c9aeccc561ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to PDF files on various domains suggests a link farm designed to host malicious content or phishing pages. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://sibservis.com/ckfinder/userfiles/files/gurarifamimilun.pdf In PDF document text
    • http://agecarekorea.com/ckupload/files/xalefosuzakeruwozutavob.pdfIn PDF document text
    • https://empresa-venta.hr/files/dodelaza.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/tatufowafebulazulurafuvu.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/34872795038.pdfIn PDF document text
    • https://pecintajp.com/contents/files/tubegagamixenikewokilo.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/zujibelozi.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/bowasivuvetixalapo.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/93917039325.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/5733713608.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/36220864791.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/48522686359.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210923012739.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/85858627181.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/91488224432.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/dekile.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/36321666867.pdfIn PDF document text
    • http://cncsprings.com/d/files/zotowevikip.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/bikute.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140120131197---kekametamuxufobere.pdfIn PDF document text
    • https://vitanov.rs/files/nirunolarazubijipokopub.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/lolunifetizazozoxod.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614479e598f49---91601156810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=main+function+of+transport+layer+in+osi+modelPDF 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_off0000bbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16644 bytes
SHA-256: bc6fce58ecbba40ffbd6d22000e1e64fd37babe815f718536621f1403f13577f
font_02_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 10988 bytes
SHA-256: ad001df700b28d2e52c9a80d5c02c75c15ab2efd61042ad093da37d17b1600c8

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