Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d054d3ee9ca268…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 16:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06954cf7483e0b1c5bb7c42702b8a176 SHA-1: 22bfd240b29145f5e67444a22463cf166d059110 SHA-256: 81d054d3ee9ca2683ef9dbf8489c1230f1dce003ac5f02c71817caf8542b508d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://queure.ru/uplcv?utm_term=speed+post+kerala PDF link annotation
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/22898682357.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/6691557792.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109101122081161.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/83559209064.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/leranifavowok.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/51827388693.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/koresesosofunowazababexeb.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/riwipodunulexevufinipo.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/wudupupanonizop.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/wobogip.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b50919e183---bopak.pdfIn PDF document text
    • http://master-br.ru/img/file/34636436409.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/83475025257.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e474fa7f8b6e90104f48797fa9f3ea01/virimipa.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/25602823923.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210912035216.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/56669280671.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/xuxiteb.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/ninidexulan.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/67423051527.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/25543043993.pdfIn PDF document text
    • 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_off0000af14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC726 14756 bytes
SHA-256: 210a6de9956fa04d6d42cd609a429708bdfa8f471f1071204dc4f14696fc720a
font_02_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 10356 bytes
SHA-256: 883ff8545ae1799e9841fa70bb68aa4a3ecc9d19b0e27341b2af27efe15ee65f

Open this report in the interactive analyzer, or submit your own file for analysis.