Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ecba3ac5817e53…

MALICIOUS

PDF

74.5 KB Created: 2021-09-13 22:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58e97fa715b8ffc116872802a2e34ae9 SHA-1: f0183412392c84ffbe197a5f61ccabbc393171c8 SHA-256: 00ecba3ac5817e53fabf9470bd62cb76a66445710538d72a2a9a98aa2acf6daa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://alacarte-grafik.de/userfiles/file/tuxofof.pdf In PDF document text
    • http://zaiger.ru/img/file/fokuxukefizebup.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/90729749804.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/564880021.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/65086013034.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efec2788724deea7d5869415a5d8cd72/51525489984.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73a345faa---zugidibubokibosopenidadur.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/12673365877.pdfIn PDF document text
    • http://preiss.at/upload_files/files/vusimuti.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109112018153046.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/45330766118.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/pimeturazesuvof.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/pujubaretizikozilotu.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/6034004285.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/18075901442.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/jobasedenivezapo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/64743949806.pdfIn PDF document text
    • https://kimcert.net/E/file/daxowuwaxutunimokomot.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/54040097142.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/duzume.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/xovekerafefinopuf.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/68981368924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=get+in+over+it+apkPDF 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_off0000bf63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF63 17756 bytes
SHA-256: 993fe8dfedeaf4590fc34c9bac5a0f8083f7fe54927fa8e587756939a06e8c24
font_01_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 10228 bytes
SHA-256: b42130131e6d0bdc57ed6c58a630c9adaeeaf020942ba7ea2753b2a4e8848d7b
font_02_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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