Malicious PDF — malware analysis report

Static analysis result for SHA-256 365431bf1ebbafef…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 07:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7543d766ce4031dfc08247c5a2ef73e1 SHA-1: dc1c7f68b75cbe6c533b3839f67a97b2cb883bdd SHA-256: 365431bf1ebbafef970fa3db74e57a2a6b139a70f1b2c4b8d6cce699a89c76e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to potentially harmful websites. The presence of embedded JavaScript points to an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=biohazard+3+android+game PDF link annotation
    • https://tonerihned.cz/userfiles/file/maseretozewelinotapideji.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/40402416582.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/sudekex.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091301262573499.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/16135198222.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132630dc91d0---jakopojemetexupovuzug.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/93325247682.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/vaxomamejefomufexomekemew.pdfIn PDF document text
    • http://canvangdientu.com/images/file/85695303881.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/tazevupebobav.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/zipejulo.pdfIn PDF document text
    • http://fructusartis.com/i/File/papinutiguku.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/4478447443.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/tolomifinuwurux.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mofiniled.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/58851824451.pdfIn PDF document text
    • http://effekt-film.de/files/file/41193697200.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/59853394171.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130772bac27b---katagapofilufim.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/67624621876.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/10067589388.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/67885415486.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/51233667707.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/76678753145.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/47984112630.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_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 10668 bytes
SHA-256: a362699305aa636a2809c0840bac5cb40a118ca4309b5d0205e20a6433eba9e0
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 17268 bytes
SHA-256: 6da97a7df11c700c15e7fe01f88f8e762af38586fecf6b5af338d19f49c4c4c8