Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1c4bbf62e3eaab…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 00:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 634debf69a5de99ac43baa3d59fdc398 SHA-1: 85a5e8e7570a237938f8e742fcabb3b2c298a8b8 SHA-256: fc1c4bbf62e3eaab75c02506dbb25e580e6e452164b31e1bdbd6f96e4419f9e5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, and heuristics indicate it is a payment redirection lure. The document contains numerous embedded URLs, many of which point to disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly suggest an exploit or redirection mechanism designed to lead the user to a fraudulent site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://everestart.com/images/stories/file/31482296320.pdf In PDF document text
    • http://lse.hu/userfiles/file/98893254490.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/73186887833.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/82678460360.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/37528236042.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090812343473499.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210914014427.pdfIn PDF document text
    • http://risme.vn/files/2152776005.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/74370829482.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/67546383522.pdfIn PDF document text
    • http://proxima-design.cz/files/file/lanepizimebunibogesa.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/66561820531.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/41294650441.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/43jk8cgckp9o95q54n9jr3317k/36248043395.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109160432203794.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/xomuvurodasevetov.pdfIn PDF document text
    • http://come2menorca.com/images/file/84129401699.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/kimezoxoludifilitixivetu.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091014054557788.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614298ac6077e---mabebinumobibaxunud.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/58483981054.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/gojokifabixum.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210910101121.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/xarokavuzateb.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/vojimemuzosebuvav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+recover+autofill+password+on+iphonePDF 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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 17880 bytes
SHA-256: a79a4dbfa545da81d38725212f3d98d5d08753dbab22215b6e104cbeb08473a0
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 10960 bytes
SHA-256: 72bc26fbacbcda4c190eadc7d41bf15543665f816b10867745d368ad306ac286
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1