Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc9d87ad68a9697…

MALICIOUS

PDF

91.8 KB Created: 2021-09-10 04:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5555f8d231871521b3e04099a2928e86 SHA-1: 4e94987701b5e5fef2baa32aee1f21ddfc87825f SHA-256: bdc9d87ad68a9697223eca174c5d09923b9fe8df986688792406d189ea10e9b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is used to redirect to external sites, likely for phishing or further malware delivery. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=iphone+xs+max+vs+s10 PDF link annotation
    • https://hantverkarenisandby.se/UserFiles/files/murojuguperorevolulexunu.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/67837368697.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/latoparu.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/35093489522.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/lumawaxodiwaxogumiwilula.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/92461182466.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/1402456154.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/34077350545.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/82982041443.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/xakewu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/46782f5a7d4fc50563767df27e72e6d2/tidupa.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/tonarebotemitiridalipobid.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/zebakagoje.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/losanudafilu.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/30918025085.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/poxekugufigukixa.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/50850371779.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f59bc031c---megujolopaxuduxuvubepobuk.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/nogimamefob.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/37880280451.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109020747508412.pdfIn PDF document text
    • https://fishuntpesca.it/file/rugigijajan.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_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 19232 bytes
SHA-256: 45c8fba753a7492020b6f79dc8087d48254d543e1eb90abf3ab3f636bea4dbb3
font_01_sfnt_off000131b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B1 10472 bytes
SHA-256: b92b025f14207d1f698323f5d5939982e9cd38dadd168c9bf665cb5345476f79
font_02_sfnt_off0001495e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1