Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa790c49527796d…

MALICIOUS

PDF

76.2 KB Created: 2021-10-07 20:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82d88cead43f2ecec20fd0d1e8495a12 SHA-1: eba9ef2c47d69f0e926238fbf75f273c9b83f402 SHA-256: 4aa790c49527796d49479346d3cc997eae0bad65b8bd02ef8862eaf179e32855
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7562

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://pixomot.ru/uplcv?utm_term=give+and+take+of+conversation PDF link annotation
    • http://jaluzipro.ru/public/userfiles/file/vuvaburuwife.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/dapavatonawe.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/94499311150.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/41320678798.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/10037683596.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/bikuwokusixagugapugod.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/mojiv.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614760b9b34a4---satupomovijekunoxabavisi.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/87237465900.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/duvijimetokotajunevok.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/riripuzezuporeserofinux.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/36990480647.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/68871455037.pdfIn PDF document text
    • http://furniture83.com/upload/files/wates.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/8810703932.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/baxelagemuzobimasejirare.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/naxagafez.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/b844harcjcb5k5ehiphe1hajr7/sabifezelaxipobiwaxumoden.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/56043051130.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/80217389715.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/44596542161.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/dodimogona.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/nobuninabenuloburan.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/miferevosenolawobafasadi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 10620 bytes
SHA-256: 64f6eb55226d59f9f40ffcf8d5fa157e7bbfd462bbdf9b47a9661868e30eb433
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1