Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d0b26cc393a4a2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 10:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e96c89b378eaf0cefcf4b403ca11a8c SHA-1: d72afc27f6d690c3a732d08e43ee99b344d0663a SHA-256: 88d0b26cc393a4a231113d1561774261452993a64cd7b0a5d52846ec226d5cd0
166 Risk Score

Malware Insights

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

The PDF contains numerous links to external documents, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://sevimticaret.net/userfiles/file/18242697771.pdf In PDF document text
    • http://nawoo.net/userData/board/file/xixilujopu.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/96152015482.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/21569037167.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/20529217621.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363108ae65d---54182052126.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/jerojokabakexemuwikoronod.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/buropitoxebaj.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/29901470037.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/wolidenokukerud.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/5409361344.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/rugom.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210905052119.pdfIn PDF document text
    • https://o-dance.com/upload/files/nunebelubajuduwelegid.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/46961373584.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/20684697620.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/xasaxonigojojuzagejud.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/14635664359.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jenukodebafum.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/90348905309.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/padubudixawenoloxerug.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/zitijapijonipexupo.pdfIn PDF document text
    • https://mlspoland.co/files/file/31309978207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=como+formatear+una+tablet+android+sin+botones+de+volumenPDF link annotation
    • 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_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 18972 bytes
SHA-256: d2b9db34256b4a1ee447f3c9881117047e29fc7f6982fd5916242f6445bb588e
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 10852 bytes
SHA-256: 2977e60e83831ec2688dfb0fd765089788bfd35abf22ec47eb546e6a7e4b423b
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1