Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c794f9f77d3b714…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 02:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f69df10ee20dbd0430c647c1c636fe78 SHA-1: 161ac832e65dd735bf2e8fa161553bd07245db9c SHA-256: 9c794f9f77d3b7144285b8f9825f2b494ef5d3081fdde33afa618bd2f6de272a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary goal appears to be directing users to a network of potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dotykbylinky.sk/_subory/subory/pomina.pdf In PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/xozavolud.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/10049501237.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/kidonotomeluw.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/61087502215.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/79149862338.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/20290381022.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/tigijelubesogigapaw.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/kumipirululumuwatuna.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131515f9ee44---jufifazifeforaxilonun.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/dejegaxeju.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/40260523944.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/190616485927.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/84972116435.pdfIn PDF document text
    • https://arendic.cl/files/49222178875.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/zidinumerut.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139a553d53---29673755414.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///46292762247.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/minimalarevulal.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lazorolexiwix.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/zemepawumuxusukamorupuze.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/54337104639.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/sesefetesu.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/39231299232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=internal+audio+screen+recorder+android+9PDF 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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 18844 bytes
SHA-256: a7405dd29abff68eede9da9a04c6c8bc5ae8d38b11c67999f837ec829ceea045
font_01_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 10584 bytes
SHA-256: 40d0a7d45075076fcb4b062182de5806847c50cfa580fc3326fe2aecfc6dc3c7

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