Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7e0cb1065af186…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 17:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ae839b2a96d0e45689c3377ca077aa2 SHA-1: 376be622495e858dbbaecdb428bb6a6e44d07b5e SHA-256: af7e0cb1065af1869e2b91bfa7509fc98037a677d9dc44e493085275b46ba6f0
126 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. The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.cenlafilm.com/siteuploads/editorimg/file/14401535696.pdf In PDF document text
    • https://onwater.my/uploads/file/dunevemixovero.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeremubi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133961ba8b87---rakulol.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/relasotiw.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/pizatekedizezefarerezu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/tujumasewogubututixoguro.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/lizetipiseruvara.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/jewof.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/37933362196.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5588a6b7---92640959908.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210910_113033.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/18346608660.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/36193763842.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/fuxosomemugerizaga.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/83728007908.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/punemog.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/vakozijuke.pdfIn PDF document text
    • http://electric-kernbichler.at/24108009816.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/xifazenexozowurodofe.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/kunedut.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/64730216845.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/kabegenupan.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/kekajewonobufudu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131639f09a81---wuwujuvowotarenurasirixu.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/penexizuzodotow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ralph+tyler+model+of+curriculum+development+pdfPDF 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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 11044 bytes
SHA-256: 795d1a7d423630267547c0c763b5bbc36c5cfcc4a7eeb829b73b36b88ddd126c
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 17984 bytes
SHA-256: aa3559df9ba95dfd6d70e61b4223efd66b31dcbfef74ced73f7d715471ab0a44
font_02_sfnt_off0001272a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1