Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2ec20bd57f330cc…

MALICIOUS

PDF

71.6 KB Created: 2021-10-04 06:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 488670ecc7396cf98b78a43a82bec219 SHA-1: 2d91b84bd806efc69d21d0d43dfcd9eacffef1b5 SHA-256: c2ec20bd57f330cc047dc469d10227b15bc6b33f0e4234e0654942710a6cfdbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8ec7104e75c57eeddd8d66651e40d0ba/mujireso.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/jerutagarag.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/lebaliziji.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/dasanatozazalikifutoj.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/punivupedonuwetef.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wajut.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/kuwilofesaxi.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/22218793043.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/purawomumixodafijasagame.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138107617cd9---wotudujekajunolewal.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/46308564995.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/ruxedunuzedemu.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/81266373106.pdfIn PDF document text
    • https://kapefashion.com/files/files/kanoruvovexiwoken.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/jituvekotagozosikokeju.pdfIn PDF document text
    • http://effekt-film.de/files/file/tuluku.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/favonawi.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210930202549.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/xupiwawibijafukisi.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/79878457606.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/18874372084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+combine+multiple+png+files+into+one+pdfPDF 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_off0000b28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28B 17568 bytes
SHA-256: cf8e492f4b214e572c3efce947eec2d2ddcd7a76717b05e50fc226194cf87832
font_01_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 11016 bytes
SHA-256: f2ba15a2556f81517cff8420f014b3bd324dffd738f8f9bb45f2f198eac7dfe8
font_02_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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