Malicious PDF — malware analysis report

Static analysis result for SHA-256 433c4a51c56dfa97…

MALICIOUS

PDF

72.2 KB Created: 2021-10-10 00:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31dd5996eb6547fd97d77a327b922b51 SHA-1: 4f286997ef38c73a12a8d2101b631cfc0934f20b SHA-256: 433c4a51c56dfa97eccf0dad23f928ff4473e7fe7c5b85ffd7716741ddc5be5c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://svltv.in/userfiles/files/36850322152.pdf In PDF document text
    • http://manpukuorder.com/uploads/files/xidot.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/51047111366.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/67309512616.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/26079102255.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/zudefamogizumuti.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/ruleledizisajotejofiba.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155e76f88e62---44407288796.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/20075870531.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/dataxe.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/34849090236.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/nenekud.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/pelonuvokixet.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615da99ca969f---jujibitujivol.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20211003123004.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/5152051509.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/59881241729.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/64077330254.pdfIn PDF document text
    • https://dom-titan.rs/files/vofuxevafujatixewatul.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/juxadomedodajon.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fujarubizopilun.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/91662107144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+fire+all+elite+passPDF 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_off0000ba64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 10104 bytes
SHA-256: ee5fc10ab31405e5508187c3a97d43566236dbd6ae208878f2c6ec5ff8e2e86e
font_01_sfnt_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 16664 bytes
SHA-256: f3de933931d06c2c6a2b1087d8e13ce16ccef139787a367a219dde0d99e5ca3b

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