Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc70d5459f01b2bd…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 16:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af462287ad74bb3cfe202554b28e9adb SHA-1: a8b7e5c7aa92e1c554b8618d93d249387fc58257 SHA-256: dc70d5459f01b2bde6e77f8e57d49b20d2be03c74cdb415cb67b6efb62948e11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or downloading further payloads. The presence of numerous external links, many on potentially disposable domains, further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://lapmaymn.samdigroup.vn/app/webroot/upload/files/wogexim.pdf In PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/6105918561.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/filere.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/13636286328.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///17282765112.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/87887280400.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/20014179996.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/medaledajakili.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/13042915095.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/sejoxivogomagiminodobe.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/91471748977.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://jongauger.com/userfiles/file/88122747928.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44189afc2---xupaxosibulevadewesobifub.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/45374312091.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/58540403959.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/varigorobaralinu.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/1240629637.pdfIn PDF document text
    • http://bankerz.in/qpic/files/13795588408.pdfIn PDF document text
    • http://donghotam.com/luutru/files/soxupojozi.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/lafenojefexetefulaziv.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/pegedabidumubutulodubune.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/18454792854.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/kujuba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303bcd756b8---sefesojosazivivupipegoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+os+dual+bootPDF 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_off0000b3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 10332 bytes
SHA-256: ccc4c3efe7d7e61a73c8690fb540bc8cfc4e8c0d316544bab18766fa4f548888
font_02_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 15392 bytes
SHA-256: c1694b7f1b69eb95023a9d9433b9094be43f62c282778be60cf9e6f3003acc4e