Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9659a257fc6c15b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 08:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9232918eae6aaa45d851a61fc6906d24 SHA-1: a9c4aa8c5cc49ce85f04a86f679a7030e7b85abf SHA-256: a9659a257fc6c15bc7abb4ba19ecbb4c666cbc02069dd2796fc114eadf0a5a02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=verify+apps+over+usb PDF link annotation
    • http://diakmelo.hu/ckfinder/userfiles/files/tivopaz.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/zufosenuru.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587961882f---zazepoxuvekomemabum.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/lobatugasoxasoti.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/47006452579.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/pofilejukina.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/13721304959.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/80462347982.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/75476920366.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/23729815014.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/42259335699.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/tupepe.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/pivefiw.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/maxakivovijowilineva.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/21994552725.pdfIn PDF document text
    • https://phr4u.com/files/15824825075.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/gezagokunabi.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/78781234014.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/fipavobimipururumiduju.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/rirejasumulinikepu.pdfIn PDF document text
    • http://pronobile.com/catalog/file/41918020580.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161375c1a2c421---luwelebamokugas.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/resinajef.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/91551869667.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/wuwumepipe.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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 10492 bytes
SHA-256: fa3fdb95fbd30d74c8d4d125f39896b76aa4d8ed67f86986aadc1607ccae92e2
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 18152 bytes
SHA-256: 0448b672a0bbcac06bf3b59455c4ca623cb8d9b97e5be07b31b6aebf589b2d0e