Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcb15b4516ac05d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e63dcdf093c38e6acc1a531a60379496 SHA-1: 2e2adb040caa089209660e119761ee1d43a0d154 SHA-256: adcb15b4516ac05dd44be77923f3e5f72d0bf69ac591a8ea13d97d1ee09cdb5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://huntic.ru/uplcv?utm_term=outlook+365+smtp+server+settings PDF link annotation
    • http://timnhanhonline.vn/upload/files/48380854032.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/8396638511.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/10473437740.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/tuxubepisimiditevipom.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/42187845281.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/wixeg.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/disuni.pdfIn PDF document text
    • https://masukpt1.com/contents/files/jakoxegazajige.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614028fae71e7---78028825881.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/47044953457.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/55192246095.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090511552373499.pdfIn PDF document text
    • http://headrepublic.pl/images/files/72805689771.pdfIn PDF document text
    • http://isvpro.com/custom/files/zomuxunajugupaxobifisofiv.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/zefisonujojokawezatasas.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/50865157762.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/visomakokiwewire.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/fuxasagi.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/sudezixuw.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/27116886203.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/fikebaw.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/58128635100.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/xazasumukirovab.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26687549650.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/95761956784.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/dobuxazosuweranuzenod.pdfIn PDF document text
    • http://tdbm.vn/upload/files/64913272653.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_off0000d3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DC 16928 bytes
SHA-256: 211d00a696400896caca12b6fd9d1fbfffae6ab9b473da88c267c48b0b24edbd
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 11192 bytes
SHA-256: 1e0b552f3d5bd3397b7d92fc4400d4b8b8fa3e534fc8ebd185c22a55408ffb21