Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c23a7871b96e4f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-13 10:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7295e9bc89fef25a4f71f7115547afc SHA-1: 29c18f2a4c035d53104b10d2a4a270ca22436004 SHA-256: b8c23a7871b96e4f9b91731dcf412dd5b55e02d40ff6e9bac30653073a30db94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to numerous PDF files, suggesting a distribution or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://myphi.biz/nbloom/fckuploads/file/fajetapolujojasuweb.pdf In PDF document text
    • https://sbmhavacilik.com/userfiles/file/16940208304.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/58182431160.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/goromazelaretogokijo.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/tiluxon.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/60243170222.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/88540103809.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/061937222993.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/35133800868.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/s2kjokib01ud04ri8r8o47m8b5/borabulalopipulaf.pdfIn PDF document text
    • http://pvvc.cz/files/felof.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/24275964816.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/36012744807.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/37189786609.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/zigafok.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/tovolosagebiravabusore.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/43262947633.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/85294009802.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/rutotipaturu.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/63968145931.pdfIn PDF document text
    • http://uco-kampen.com/media/files/56526438119.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/52209215431.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/wawetet.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/piwowarizunuzafipexoweju.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/74834844944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pidgin+app+for+androidPDF 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_off0000bf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF37 10232 bytes
SHA-256: d9447b031fc5f184f6c6c00b3e7d1c0de5bf804000931749a275f371c9ed0277
font_01_sfnt_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 17044 bytes
SHA-256: fb3bd4c58f4557e5cdf2d17df22c7389729bde8bdf2f4aa3b6c6fd6e4450afdd
font_02_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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