Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de7b20c07a3f100…

MALICIOUS

PDF

95.6 KB Created: 2021-09-18 17:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c9350506690f4792ffe95ce137b4544 SHA-1: fda653fef4d8de9efb71139528b7214a676f53d0 SHA-256: 0de7b20c07a3f100b186182fffe0d8038cc1baa1ebcd55ed9c36a96c083cf8f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating phishing activity. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely intended to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://strongpointmarketing.net/userfiles/file/85858142278.pdf In PDF document text
    • http://kursadowicz.pl/Upload/file/vunepimavibudafajaru.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/vogosovigepiji.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/zuvukasasagefubegor.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/57490239194.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/pazifofesezalelar.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/totowaxikevavilex.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/redevoju.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/fenetunamuzit.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/romugenije.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/38521837853.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/86741710440.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/45621897541.pdfIn PDF document text
    • http://orderkai.com/uploads/files/rutapunumulawexol.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/78804458147.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/sonaturiwokakaduzujozen.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/7361993227.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139a6b61e5---12540307940.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/batetevekoboku.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcc69ed57---4730425230.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/14347965020.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/voker.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210914193727.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/kagomopig.pdfIn PDF document text
    • http://partnercable.com/files/wofupel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+dragon+ball+z+episodes+freePDF 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_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 11092 bytes
SHA-256: 2b43e09a22bb78bc4a6263683377eb1802c0c9edef0f5ca3dcb4b67ee07d08ba
font_02_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 25952 bytes
SHA-256: 6c63bb2e3844f0b805657f76b62ae77cdc32fe6e3150fafca97384429a1ed25c