Malicious PDF — malware analysis report

Static analysis result for SHA-256 587a6c7f7bf82e78…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 06:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2dafd3d26117d1d114d8d757d29ad55 SHA-1: b150570ea3b02f495b138f557ea62500980ae481 SHA-256: 587a6c7f7bf82e7861d0457466048681858807e69a77453c1f1a53b08438271b
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, many pointing to potentially malicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. While no scripts were extracted, the presence of external URIs and the link farm heuristic suggest the PDF's primary purpose is to redirect users to malicious websites, likely for phishing or further malware delivery.

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://truhlarstvisollner.cz/data/file/45182353512.pdf In PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/pamuxurekakopuzusawa.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/95478653370.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3005d2da---lulatabupanuvativowosule.pdfIn PDF document text
    • https://schmitz.cz/res/file/86964399109.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/47278875619.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/jidukegejojapiduga.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/95246598967.pdfIn PDF document text
    • http://dominant.name/userfiles/file/wupiba.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/sozewef.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/6152531780.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/21086989289.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/natozuja.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9b0c28425826238afc003af1906bfd54/14393475485.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/gopefuvimikomuloravusa.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/dijuzibiwupefirizeweseg.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/vifebavinuf.pdfIn PDF document text
    • http://metabolit.ru/files/file/zogaberovojamusoka.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/55856907829.pdfIn PDF document text
    • http://vlajamo.cz/images/file/wuvolabesemuwowejefifu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/lutigagasutago.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/zerisimaroxefox.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/dinagiwebopepanadogu.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/39222090066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mirror+collage+apk+downloadPDF 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_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 18664 bytes
SHA-256: ac07e67bb71b042d4b660f1b36493eb4e9e3f362784ac24c6cfd782a8961740e
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10596 bytes
SHA-256: 10cc128e3fdea77957d2e6c17ca1175648155470c62dd5b2b4c1e6001b145b27

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