Malicious PDF — malware analysis report

Static analysis result for SHA-256 833a552e9975840f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 08:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2acf8bae3fb02d0df3d3482490c1920d SHA-1: 398db1405075d86bd670445ded1ec4df420c758b SHA-256: 833a552e9975840f980c75355be8e4ec5a6511f0c5e1709a556efba1e5634bc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests a malicious intent to obscure the true destination. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content within the PDF structure.

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 https://gencerenerji.com/resimler/files/zelofabugoxites.pdf In PDF document text
    • https://cingenito.ca/upload/editor/file/kumimedimeliwiweruvesena.pdfIn PDF document text
    • http://e-menu.hu/editor_up/25298430411.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/94860601684.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/dugorabexikezi.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/raguviwetezifimerax.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/debojegerewuzidu.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/26245230556.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/31265468583.pdfIn PDF document text
    • http://strategieb2b.ca/userfiles/file/78106247956.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b0521ea440dd03e40b84720708e07e89/93625298848.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/gobemoniton.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/80596902725.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/84663488074.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/37078510516.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/77244483564.pdfIn PDF document text
    • http://freewest.at/soseriwuv.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/mepazasakilagaj.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/vadunujufufazakorus.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/nivobujujatanosug.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143ad1b27f0b---57626317198.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/17209784532.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/wazijivos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=filmy4wap+web+series+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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10728 bytes
SHA-256: e358053dc59cebfd36767d5631f65e541f2a1df4fb71959eff0d433cb50b2747
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 17796 bytes
SHA-256: a44cf6fa63c81414c68d102b26b21bde30e9986f7de9d2f82597ef82d31b3379

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