Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b3a46a1faba4e1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-08 15:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7aaf43586dc1be9476f5ca4a1d3f4206 SHA-1: 5aed800e9885dec9389039ba83d8c059395f58c1 SHA-256: 73b3a46a1faba4e1ff712f0e2f98b1d3d0b968aaff890fdf3b5ba45a0caa79e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, indicating an attempt to execute malicious code. The PDF also functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme.

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://laxycoffee.com/upload/files/25142001519.pdf In PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323744c290b---lemelujejiku.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/22078592221.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/nuzetunawikatirawome.pdfIn PDF document text
    • https://telorgabus.com/contents/files/50609150936.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/tufexepex.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/sapunepubu.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/66272863962.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/40201660432.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/91697585297.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/vuxukunuxis.pdfIn PDF document text
    • https://ms01bet.net/contents/files/ginodixe.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/rixilosoza.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/zubovupev.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac9d6f045---26339132815.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/fuzofogikevenewuso.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/vaxetogemuwu.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/dorawopijoraveresowo.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/nefar.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/musovutapibones.pdfIn PDF document text
    • http://hevolta.com/upload/file/42811561783.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/jemozovurovadamizawowuju.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/89539928002.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/55699937043.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/xozodifineselexolef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fitbit+inspire+hr+user+manual+pdfPDF 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_off0000bb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 10860 bytes
SHA-256: 636acd0d39040bc235a147495b8978b62092d73f62501e5e3c6139f0839a9d70
font_02_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16044 bytes
SHA-256: c3097bc3cd230d420374b187c57be1df57eefbec0b259fbf1933cd6a3c35aea4