Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b49a6f45b4eae36…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 00:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d737c48c334ab410d382c223147f0883 SHA-1: f22c222ecfe8b8c06257730ce900c013e226471c SHA-256: 6b49a6f45b4eae362839ae3df2fe4d74643c6e09ee981a4de1dc6ee202054982
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on diverse domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or distribute further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://candientuvibra.com/images/file/mojomos.pdf In PDF document text
    • http://school15-tyumen.ru/f/64684773231.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091202563125.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/43932831800.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8ba63a69bac7a96b6d35da1851994481/tukikabikiboxara.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/dokewiliguseguxisovek.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/tupol.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/65128748293.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/60366254201.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/37496641414.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/13881642931.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/16694638085.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/38640502217.pdfIn PDF document text
    • http://mayjack.com/upload/files/30774738633.pdfIn PDF document text
    • http://7profi.net/userfiles/file/gepukelogilurubeketoxop.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/34518514101.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/20358723367.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210914090611.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zasisevosanodenoxamafube.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/fopovupu.pdfIn PDF document text
    • https://pepsima.biz/files/file/galerosojulepaxugepejen.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfb51f524---771553590.pdfIn PDF document text
    • http://preiss.at/upload_files/files/78627272459.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chord+gitar+simplePDF 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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 18000 bytes
SHA-256: 9a8dcf715ad845060379f9867b8f31590b2238341ca924332b8d6febc8f3b194
font_01_sfnt_off00010b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 10768 bytes
SHA-256: 6c30b2b633965cdb7b0345b67b9685d495d30b325c94da60137a4ef96dac7992

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