Malicious PDF — malware analysis report

Static analysis result for SHA-256 4862a2c3be33ca96…

MALICIOUS

PDF

94.2 KB Created: 2021-09-11 06:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23587c346a5ed6cf73cee38eb813b3e2 SHA-1: da4d61402216505775ffa39219a403456da9e285 SHA-256: 4862a2c3be33ca969cee9998829cc5be5b1bff321193b7361b7b7dc4d663c163
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to disposable domains or potentially malicious content, consistent with a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0abe4c25---sufigerefo.pdf In PDF document text
    • https://marugame.hk/editor_upload/file/rinolobigonowewi.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/16452727651.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/mumilizubitiroduzagizoxot.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/xegutaxaxusanal.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/25nvhf0ggro51dqkrm3qrl7045/61539115118.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/ferufeduxagokibowawa.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/32588298792.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/98803960244.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/pelubojesanuginavopagita.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bitovedal.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/84141988101.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/kiregixagapene.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/60014502869.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/zesupitolifujodezawomeso.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/nularadovosinoloz.pdfIn PDF document text
    • http://humanlitech.com/files/files/82969197130.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/siteniritinisiderobuvev.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/weluwoxebemoduzowimabaruv.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3dccd9c1---dinebakumif.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/57754093862.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/23268726092.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/varofigikezopefevav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+turn+on+hotspot+for+androidPDF 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_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 19788 bytes
SHA-256: 47513eae8eb781989d8bb80da44227085997e6248c7b72db9ad3c21973164c2c
font_01_sfnt_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 10596 bytes
SHA-256: 481ce5015ef3662cf983b070fe47d061c3a953435bf080a217eecabdef4952ad
font_02_sfnt_off00015311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1