Malicious PDF — malware analysis report

Static analysis result for SHA-256 437e41110b947f3f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 23:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e4e3a4060c18ac1f668cf8c1a47b4bb SHA-1: 8990b2ac5ea9872c65951da58393286d0d2eb63d SHA-256: 437e41110b947f3f39feaa89e5ec6e485da83a7f01c12e8f6cd6fb4b45faea4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beautydiction.com/ckfinder/userfiles/files/zegopuledimod.pdf In PDF document text
    • http://thecargonepal.com/userfiles/file/kepemudore.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/lamowedipupabaxurogidani.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/zotetowiwoxiguzitan.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/jovabozora.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/8af9b4b32dfc6b1c7f7b7d6115b7a9f9/7564902283.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/ditejepifikuredebowopuzi.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/45898431234.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/jalitazatagiterug.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/jurijoreru.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/8158499959.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/58760819986.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/fuvodivixabewinivi.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/vomowuzopiwafavakutod.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/5506002582.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39c18c77c---taroj.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/63443997695.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/33909606222.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xazatabuzelovixutibe.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jebirojosobibubexaberej.pdfIn PDF document text
    • http://cl-pub.com/files/files/pimutaruw.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/keresunigebuzoraravizanu.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jilaborarute.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/polerosilanesesulip.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/gibujinesafupologofifavov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+android+app+for+screen+recordingPDF 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_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 17440 bytes
SHA-256: f8438453aaae0a2b62c237c268abe1bcdc2d4313d853c74ce3a8cc855a958fcc
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 10804 bytes
SHA-256: 7ba18f0358a08c0be17cdf4327277e1dd79e40baf53e9523ac86555ad8e1eb0b