Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2d607c650f6492…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 21:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e80979ee1d6a587a82a6b3e3782bf569 SHA-1: 5c3a114bf2bb716ccd7ff171725fce0eeff9025b SHA-256: 4c2d607c650f64928cb91b425095411e2e94fc80714a624f46011aba5321672b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to unknown PDF files on various domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports the interpretation of this file as a malicious link aggregator.

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://masihpt1.com/contents/files/guxufonigefaxinu.pdf In PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/nifulafiw.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/joruboko.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/foderagi.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/73193813866.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/pujerax.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/tupezopiguxuwosuwe.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210902055244.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/tebijivuvifebo.pdfIn PDF document text
    • http://fxmeat.com/upload/file/95fcdab1290f4539c3146040acbbfff7.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191656372611.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/doxuvipifugudapetuk.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffd167dc1---tixun.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/78310052510.pdfIn PDF document text
    • http://ebus.cn/up_file/file/zubusone.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dudov.pdfIn PDF document text
    • http://nanopena.cz/upload/file/93833375155.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/67066012089.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/90333276136.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/40990636758.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/wexuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+avatarify+apkPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/dexoxexovisikob.pdfIn PDF document text
    • 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_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 10548 bytes
SHA-256: 71fcbf7edf4aa29720aa03c4dcf66eff1df9ab7a89b033a63648867dec66ce30
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 17868 bytes
SHA-256: a7e0d86ac8fe498f0d4c6e563bb239971c9a6335c80ffad90a94a2dc7dea62ec

Open this report in the interactive analyzer, or submit your own file for analysis.