Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6a537649b5a4b9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 23:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 042e7f423bf6713b700fce87a61ad3fd SHA-1: ba467b893ed40566c4c433e6f9175695cdb080c5 SHA-256: 7b6a537649b5a4b944864decef82fa50d1e25a434e8b2c19ba9665557034e12e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm designed to redirect users. The embedded URLs and the PDF structure suggest an attempt to lure victims to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oykufestivali.com/ckfinder/userfiles/files/panadiwavotu.pdf In PDF document text
    • http://skolicka.eu/foto/images/file/bizelol.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f6d208bd---87683149807.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/dunejedosu.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/povovutalunosam.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/zanisasawonak.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/gumolemuf.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/wodijilami.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/34418224143.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/teferexapawaluv.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/boreduzudag.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/mulubuwipixes.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/26828115788.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/vosusarakamexiw.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bapujuwalik.pdfIn PDF document text
    • https://harom.ro/files/file/monawe.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/18162793443.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/wosapexinuwilafiwanasej.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/32477634022.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/11049374382.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/wenafajepixux.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc66030519---jexamekutizivagojefiw.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/davulusixegani.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109081311184403.pdfIn PDF document text
    • http://labradory.pl/file/dujeb.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/25952994318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=countdown+widget+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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 18648 bytes
SHA-256: 80cb18e2ac4d86c2ef710a3f4eb0a68544f72071c195d77097c622f8bb9ceaac
font_01_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 10560 bytes
SHA-256: f1a13cc0550725956037eca73bf564d2553f87856eae1ce8aa82ef61dc2f2b3e

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