Malicious PDF — malware analysis report

Static analysis result for SHA-256 75914434b159c32e…

MALICIOUS

PDF

84.1 KB Created: 2021-03-02 00:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bfdade9caee4f9e9c74b7032a8716289 SHA-1: 921352b71eaaf66fcf8bb5247c5002234a6cf5ec SHA-256: 75914434b159c32eca558a133992f5a6efe6745568cfd54472f6c0bd92dc1695
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests the document's primary purpose is to redirect users to potentially harmful websites. The document body contains garbled text and metadata, but the embedded URLs are the most significant indicators of its function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=how+much+is+itil+4+foundation+exam PDF link annotation
    • http://dolekil.22web.org/excel_vba_range_variable_type.pdfIn PDF document text
    • http://noseboxejekuxaz.22web.org/xbox_one_wired_controller_connected_but_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475997/normal_600714a4bb2ef.pdfIn PDF document text
    • https://mejawazur.weebly.com/uploads/1/3/4/2/134265830/kisaso_femikonol_witif_rusolakex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_60135dc600360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5febeea960e2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_60343fb97e892.pdfIn PDF document text
    • https://tuzunogosur.weebly.com/uploads/1/3/0/8/130815213/nezop.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/kutobubejokugo-gikot.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/dungeons_and_dragons_5th_edition_dungeon_masters_guide.pdfIn PDF document text
    • http://fafikup.scienceontheweb.net/cuales_son_los_beneficios_del_betabel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_602ecd1cde735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/bopadi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/13653809927.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://scripts.sil.org/OFLIn 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_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 5372 bytes
SHA-256: d6d52167a07520c4ef0e6ddb667a392db2e681e669fc129fed8b71ad9e09ca06
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 10816 bytes
SHA-256: cd5c0d8a9557b7a12fa4abb8e188a44f2939d4356a7f318abe416f3e30d1d4ef
font_02_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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