Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ff45a5a85a9cb5…

MALICIOUS

PDF

89.9 KB Created: 2021-08-10 06:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e77a2e9f0b8d64bdb6200ca52b72da2 SHA-1: b0300c5fa34b058a31ca750abfd144a610a60056 SHA-256: 78ff45a5a85a9cb5c77e2dc72a3bba12351b3bedb89d19f786f0f7e61a4940a6
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. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to direct users to potentially harmful external content.

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 http://bisenzia.it/userfiles/files/dimupup.pdf In PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/vumukasufabusejulibumam.pdfIn PDF document text
    • https://ckmandarin.com/uploads/47091301979.pdfIn PDF document text
    • https://linoforti.it/file/dulil.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1ef93ea44ea92c68694a8929bb05c76/86951257010.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/ziduxolepoxisuronapek.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/322271209.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/mubezuruduwifogase.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/69183055694.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210718/file/16266309906900.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fdd3204de---90181773424.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/wizosebavanebifolapufiwi.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/70718936856.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/45242424124.pdfIn PDF document text
    • https://mihalex.by/files/files/mefiripa.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/51088294488.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/jizesufixebenekigizetan.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/82548517735.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/74197842816.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/79492976258.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/16975733616.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/durivewufatumelibewogaje.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/99219080376.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/29314232420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fl+studio+11+producer+edition+free+downloadPDF 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_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 18612 bytes
SHA-256: cf283963096a59dc767ee92c8c33b9bc1d817ca43076f5367b27dc17a0244193
font_01_sfnt_off0001285c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14073 10828 bytes
SHA-256: 3de817e7c768b9a891888e9d210777965e669e57534c2189fc7818bfeb1bd743

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