Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bf72cff08e0dbe…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 10:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e2e128c13c9a36f77dcec1cd61512f7 SHA-1: 50eb60b54d2498cccd29c6e45f1bc50d064670af SHA-256: c7bf72cff08e0dbe1239a4c48947cd067f69e31bb255e13912488d9303639091
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 high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://stijsr.com/userfiles/file/71329896141.pdf In PDF document text
    • http://louisamerino.com/userfiles/file/nedewexogunuxuvusitesas.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/29934198607.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/sikunebotuseta.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021918918117730.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109150330554882.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/bonisovemugalezimol.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/2109062204146941821f2ag.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/17615898064.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/80739494208.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/wogevafimale.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/xofodozo.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/11389387382.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/fefuva.pdfIn PDF document text
    • https://tepihtrava.rs/files/nusulu.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/detasugefopozodu.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/82939771962.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/vumejezuxuxexufez.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/13524789148.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/51262669959.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/93411385720.pdfIn PDF document text
    • http://serting.eu/userfiles/files/lujuseba.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/8059302537.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/72887151920.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16140330a2a6d9---tokeziwerisado.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/winedikezilose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=grabar+pantalla+android+sin+root+sin+pcPDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10552 bytes
SHA-256: d316300705e2989011b59d35805e1c7b008ab66abffffcc5d7134fd6ecf020dc
font_01_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 18776 bytes
SHA-256: e8ce5f4e5332cc5c415f2370b276fc1f85db9c23f5c087acb2f4136bd556b550

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