Malicious PDF — malware analysis report

Static analysis result for SHA-256 7318210a689fca26…

MALICIOUS

PDF

70.5 KB Created: 2021-09-16 01:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aecc8831f829b06e766a4468195e1e24 SHA-1: 4d012169da7da49a5752d2a3166a873968a5e652 SHA-256: 7318210a689fca26cce50b79d9c05deba39a5301addba22ab446221a9527aad6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to host or redirect to malicious content, suggesting a phishing or content-luring attack pattern. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://timeyear-v.com/userfiles/file/davapelumud.pdf In PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/58155944237.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/vizulakin.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210910050341.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/9173347135.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/gimawepiwuk.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/78603015696.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/jexurigipometizosav.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/93346424387.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109060721128874.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/18507192818.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/dojemejav.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zerowutajir.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/kubutirorutukepoxo.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-11/20210911051708594342.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/94044173663.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/faxowesefusutew.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/84884422721.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/noxosirefetaveje.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e8a3ad71b7d0432f1fe1a113f634f58c/88209922062.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142660cdc59f---matazit.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/jorukusedanasutewexoseb.pdfIn PDF document text
    • https://rotitelor.com/contents/files/xerivomediniduj.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109112202101876.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/jewotafirakitomoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ka4ka+%D0%B8%D0%B3%D1%80%D1%8B+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF 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_off0000b3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B2 10988 bytes
SHA-256: 789a6e4d72aa10958eedfcefab1c9ca8dda220116322a310d75ed3a5a426a7a7
font_01_sfnt_off0000cca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 15152 bytes
SHA-256: 18923334cf7a884d605fcc0c72288d705ce24dd2de4197fc6dd7d13e082e1602