Malicious PDF — malware analysis report

Static analysis result for SHA-256 20706b54c4ad538e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 15:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3746d0cf2b25be7be97aada116a44024 SHA-1: 57a2c697f242ec2662ccda2d38819a5652f46a06 SHA-256: 20706b54c4ad538e105389b5a92774452e9ecb58add76a860e7a68bf7f2d5d26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous URLs, many of which point to disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The embedded JavaScript likely facilitates redirection to these external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wangguanhardware.com/userfiles/file/mimawe.pdf In PDF document text
    • https://kovtec.pl/eurostyl/photos/file/50478543289.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b9f156e5---xozusuwasiji.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fufemaxipupedaf.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/masikavojofivikoze.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/nalibekosofinutejug.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/97394915855.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/86674415913.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333c4a78097---vijib.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/88550479091.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/numimo.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/43137500483.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wufijowaxujadatojaganinat.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/susix.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/sudikudubanakiv.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/25373578483.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/16683958471.pdfIn PDF document text
    • https://carlojans.com/cms/file/51912371995.pdfIn PDF document text
    • http://lovesenergy.nl/file/19367994457.pdfIn PDF document text
    • https://hsse.cl/files/16289082598.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/83129760596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+smart+linkPDF 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_off0000d137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD137 17464 bytes
SHA-256: 0e2ec023dcb39145034992a53623f9e7a23e722287314becd5fad700d6cad726
font_01_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 10352 bytes
SHA-256: 3a776ccbc41f166214a73316db2e830307ad275f6d23739a3cde0f879634e0ea
font_02_sfnt_off00011628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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