Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e62058fc5b8e25…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 03:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 26ad99a36b204ddff696c7e5dfdf84a7 SHA-1: 95d3a64b740a2641a553c00bbcf083ff49b2acc4 SHA-256: 42e62058fc5b8e25147c23b29fae6f93217dd5f57e493818c69ed5f3c1126882
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs that likely lead to phishing sites or further malware downloads. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=watch+the+avengers+free PDF link annotation
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/34092554162.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a5b74c12---58120004512.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/5839119003.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/xegeja.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/71033536214.pdfIn PDF document text
    • https://camelcarpet.org/d/files/zeliredugodu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93003583831.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/tadosefelidu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435a8c33f6d---nuxomunukexumadesunegan.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/44905850020.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/35368862113.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/47341353538.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/50028551528.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/barenofenuravapuvo.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/baludusevoveliwivakinabi.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/lolexesemen.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210915_223232.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/luwararodolu.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/nolil.pdfIn PDF document text
    • https://12tiga.com/contents/files/lutet.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/47491883536.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68497489407.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/76810981268.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_off0000be98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE98 17864 bytes
SHA-256: 825938349ee51f2dad8c431d0642b74f405e030327f2fe0d4bc424d5c0449d45
font_01_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 10416 bytes
SHA-256: cc787426c3643670bd4419cac46c15301cc9bcfd9f0cdea77767ca41a4e18d63

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