Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6e4d58caf4df2d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 18:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd3c06586eca032226b91a2b0ff7bf75 SHA-1: 53ad02efcb012a17bc13068f7b6a86578e49d18b SHA-256: 3c6e4d58caf4df2d8aaef6b89e03418b7fdee8caa4618b9bf18930ad7dbd3510
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to or download from these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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
  • 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://infrive.ru/uplcv?utm_term=dark+theme+extension+chrome PDF link annotation
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b69ad6a069---20467262529.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/82541543538.pdfIn PDF document text
    • http://iccarrentals.com/files/file/vatoj.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/77198447586.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/95aafc2d2fffe76a0a3a510485fbbac6/31212084573.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/ketuviletowitisaxakexov.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/38073386730.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/wupufotubiwuseserikagug.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/musixajivijimeras.pdfIn PDF document text
    • http://kechengchem.com/upload/files/nezobivumelifaj.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/95948628460.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/rugumuzuzinagepalo.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/74044960834.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lerozugota.pdfIn PDF document text
    • http://js-space.de/userfiles/file/5871252681.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/rekurekuvanimaxidatubatij.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/82665580589.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/80702569940.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/7463133630.pdfIn PDF document text
    • http://myesen.life/userfiles/file/44239520209.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/48924308564.pdfIn PDF document text
    • http://gardatrans.com/content/Files/tawavuf.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/sabikawijenaxiwobomij.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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 10644 bytes
SHA-256: 7bdb22850b7d50d7feb4258a9f7e7d20ced70cdd178c03d73d2c7d69a85a933d
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 18184 bytes
SHA-256: c6961ea134bba6ce3d8bc914efed05d7b02fcb44b3f754fdb6b73b8b20211757
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1