Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c4e2bea1dd07b6…

MALICIOUS

PDF

94.8 KB Created: 2021-09-18 21:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40f509ad33f89fb7cce216fe71695d3e SHA-1: a6bea6895d8836020b67dd3f3399b5a9961c4b64 SHA-256: 43c4e2bea1dd07b6158bde034a244443ce45687943ac95b69e2da99a7a632f3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of external links and the overall detection profile strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=amazon+firestick+wiki PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fddac85b65---43942659380.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/ripexavo.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2421376a---toxirale.pdfIn PDF document text
    • https://fond.ru/userfiles/file/95666635708.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/57674277054.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/41173390955.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/vikelato.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/44910171509.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gevogiro.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/31834818031.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/86554398239.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/fovixisutedoxi.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/pobodisomen.pdfIn PDF document text
    • https://paradigma.bg/uf/file/xikafijibitoxik.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/bilatevowabupo.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/kikoxisubopebonabajisil.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/nijibunosilibifukoko.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/39953232956.pdfIn PDF document text
    • https://cargotavio.ru/files/file/faroki.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210906143646.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/64648601044.pdfIn PDF document text
    • http://xfswchem.com/upload/files/zijilesire.pdfIn PDF document text
    • https://salonrewards.ca/images/file/36431817020.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/92289173452.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/mupowuju.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_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 19348 bytes
SHA-256: f1f4efaeefd70df977f0287e8c27a2c1dd5d03c8bd192ad956807fed59516cc9
font_01_sfnt_off00013cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 10668 bytes
SHA-256: 307e949ce9ac1b726c69de6d0e73a63c17bd59181c5fbb3e73c7a82a53015206
font_02_sfnt_off0001558f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1558F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1