Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc400a12c9d313c…

MALICIOUS

PDF

98.0 KB Created: 2021-09-13 22:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0db2228618cf98545a2e1d4a96b3ddf SHA-1: 348d7880032ed6bfbec95e54a45cbc4fdc619e6c SHA-256: 0bc400a12c9d313c30a93665dae242d6931b22b99f8799a96c7d6d301da721bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The sample also exhibits characteristics of a link farm, with numerous distinct hosts and URLs, suggesting an attempt to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://csc020.com/userfiles/file/20210907154553_7kdt1n.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a097f99a026b63f03f7e46ece3f19e3b/36748342506.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/pufomedunotegagadar.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/67811826739.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd4c67918---22190146848.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/93314479178.pdfIn PDF document text
    • http://househouse.it/userfiles/files/51419386783.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/10957035922.pdfIn PDF document text
    • https://argumentua.com/i/file/gubumu.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/terujosolemamumiduposu.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/padakoreroze.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_032308.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/gelulawi.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/61740561431.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/jaruxapanopejibarov.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/43444614612.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/83522352580.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/11150096581.pdfIn PDF document text
    • http://runo34.ru/attachments/file/kimilosojufifinerodi.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/7950670255.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/98997282452.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/memarikarobokuzezorivi.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/82726907804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ruthless+pragmatism+meaningPDF 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_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 10724 bytes
SHA-256: 6a8a86e2294e7fdb95ecdf3fb7067c07fa8b3573f2deb5807d6e6e543849eee2
font_01_sfnt_off0001335d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6F 18256 bytes
SHA-256: a9837557503aad664cd8af6519de5f667c751ec4dc22e1f6699d40f2e70268f9

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