Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d002826d86705f…

MALICIOUS

PDF

69.8 KB Created: 2021-10-08 09:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4d66e93ea5d002e9fd0d05f5cd768a38 SHA-1: 48181ea004320d98a8b6885e1ca6d08c245f0ab1 SHA-256: 23d002826d86705f3c219bd498d2500f5cbf04f1e4ee8d5d52770158c4a73d1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/99b959a45d6f6a0ef48a1cd7be966f5a/ketedapajegaziresadiput.pdf In PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/28383782136.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/nozafakasumepekezot.pdfIn PDF document text
    • http://kaies.net/upfiles/2110042028572479969j24to.pdfIn PDF document text
    • https://csodamalom.hu/files/files/58233773260.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109171312586176.pdfIn PDF document text
    • https://citronel.com/userfiles/files/leligiror.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/gilosena.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/runigudozosa.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/46337406540.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/56530618132.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/wodujimufanewebediwef.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/zowumadigi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb76b9da73---xekulizowebu.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/lidop.pdfIn PDF document text
    • https://sportscientistsviews.ijmsir.com/ckfinder/userfiles/files/wefikedasokopasiseda.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/nurejibonopegoxodexijaza.pdfIn PDF document text
    • https://adci.vn/data/upload/file/77716224310.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/nofirajaretulogazetije.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/pavavamowututoduwakax.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/27640982747.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sokanakozugowaletulega.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/vojogexinabapiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=principle+of+financial+accounting+ifrs+edition+second+editionPDF 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_off0000b069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB069 10896 bytes
SHA-256: 4e68628ea55399c943b96c4dc5b772b9642b0c725621b267d2a0ebdcbc2d2d47
font_01_sfnt_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 15664 bytes
SHA-256: 0523fd896a99fa060eb07018caf116c807384bd05875b8ba4f4e2a2470ee275e
font_02_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1