Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6046d793c0d790d…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 17:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4708f404a88278846cec34219a9c3328 SHA-1: b1ee61d534939a6f3c84ef096423ebe7a66eb97c SHA-256: b6046d793c0d790da074222c980f2874041d421251ecc16d72059860bbdb2cbe
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. This script likely redirects the user to external URLs, as indicated by the numerous extracted URIs, many of which are associated with link farms and potentially phishing or scam content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=popping+back+acne PDF link annotation
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/36032418702.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/43094227339.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/47726912672.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/25176833293.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/67477928528.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/xigisejode.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/maniban.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/73359483818.pdfIn PDF document text
    • http://quranday.org/userfiles/file/sixamepu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/kaxekitarolen.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210928055100.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/jesojajapitividufelel.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/jekoxojitofogaji.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/palazudogusiza.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/mokubasuji.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b38919228.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/35882517656.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/bujetubatokoxogusix.pdfIn PDF document text
    • https://luminex.pl/upload/file/tenunureleluxe.pdfIn PDF document text
    • http://coolscape.info/images/files/51368834623.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/jubojewal.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/84083024767.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/tukitiratilanobewopubi.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zuvumategizasuzefa.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_off0000b1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E9 14932 bytes
SHA-256: b3a70bdceccf93e50367fbb483cec5447b34d77604f219fb05a8791e72d1863e
font_01_sfnt_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 10368 bytes
SHA-256: 151cd6f29445a6e7419f99d7a22f4f0c5090510e98d7df5795d95926e0b69680