Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e1e602f75a8b1e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 10:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9524e4efba564714dd6548d15b38006a SHA-1: 63e3d724e1e9614d227f7df1f7246ed8b952abfb SHA-256: c8e1e602f75a8b1ea0879296a45f4eb9d53e4dc5dd24b1e1253f3dffa0eaff4c
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, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=adobe+photoshop+lightroom+premium+apk PDF link annotation
    • https://huaku3c.tw/uploads/files/202109130811564910.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/vizifuxevozafuv.pdfIn PDF document text
    • https://avenue102.com/uploads/file/pefinelululin.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/pozolo.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/54851321796.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/sebozojuker.pdfIn PDF document text
    • http://mlead.net/images/e/file/3142314744.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/21934194641.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/73314673703.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/xotakukuwojojijotanagova.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/gelumavupuvomemukaka.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0kl16u7mjrs3hcf7fohh3mttn0/57976369511.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/votezonogisasojeziwux.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/45906891897.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/59250267745.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/8706203237.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/lugexujevapurer.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630928633.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/wemezu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/malagobalegamez.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/70630816201.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/84hqf00g5oo2mscetq1jgjqrkc/fefoxiv.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/widomulipa.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/petemoraf.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/70160416654.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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 11048 bytes
SHA-256: 9ee0811c221c482dcbc2e7d88afa6fe045aed564d4fadd54599e5446b19bdbbe
font_01_sfnt_off0000f734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 17096 bytes
SHA-256: 3853a68b1a3e3d2e6a24799245d13df3ad31a4e9b7501a3a982943809a0475c8
font_02_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1