Malicious PDF — malware analysis report

Static analysis result for SHA-256 afaf6616af0a81eb…

MALICIOUS

PDF

75.6 KB Created: 2021-09-26 21:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4505df8e12c88e9554a107d11a9ccb58 SHA-1: c8ae13bbf90243f3d1e2afbe39706c0706b6aa8b SHA-256: afaf6616af0a81eb4b89a1fe1fbab130a40f26a1eea5d8c2fece7335c9579765
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown or suspicious domains, indicating a potential phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bancodevida.com/bancodevida/admin/images/image/file/1102528670.pdf In PDF document text
    • https://cartolmania.it/file/57875755644.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/dexopepifig.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/mupatokej.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/divuxusovinokewefifedeg.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/47711019071.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/sijemikani.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/seragovimizunodikavow.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/fopuwepisa.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210906_071816.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/gimikizozururatutazudig.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/botukekelezifetudipik.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/67194620611.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091005525268.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/29512456868.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/68480310564.pdfIn PDF document text
    • http://egitara.com/upfiles/files/jabosotakoxafelofakom.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xilejabefupag.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/mujoxezokutelagovawovose.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614c06042fb0a---2799787842.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/suvazalodigonuk.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/repalifupos.pdfIn PDF document text
    • http://rubensova16.cz/files/file/lexidigofekukavinox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=data+structures+using+c%2B%2B+notesPDF 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_off0000b9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 10460 bytes
SHA-256: da4a39a6c02cf9df0444aeada2f34287ea7e250548990213a00ec8d266d01f21
font_01_sfnt_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 21260 bytes
SHA-256: 019c56230edaf2b80def52a3a4b0faabf254236561e7e613845b83cebbd0956d