Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ff263aa7c4c583…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 01:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4af934232fecbd4a4f15e478b27d71d6 SHA-1: 38003685d03c5659b2a7c0c3aa091f3da0e527eb SHA-256: 21ff263aa7c4c58377f35825bc30964a927333c7af581fb218a9b762c115073e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=sky+sports+mobile+tv+apk PDF link annotation
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/48238701030.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/45387848824.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109070302246755.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109091949243653.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/lonogoraji.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/nowanafaworuwugutemaj.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/33862142316.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/rureralusur.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/felopizerabubo.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/55822552576.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/41546749823.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/j7frll0mk19tm4a3tmpth40vdf/badewiv.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109162108386955.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/98712409150.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202108312130541062.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/37320977577.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/14799725129.pdfIn PDF document text
    • http://indemo.pl/Image/files/potosubalovoxi.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/begegomiwi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430a1e8abd7---59693801387.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/88020876202.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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 17880 bytes
SHA-256: 991f654cce4a93903ea5918b1f2e180d72ce5f5e385decba7c0bc67246a51773
font_01_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BC 10796 bytes
SHA-256: fe3f56d0c11bc7d30a4ce91b0b384e3f3398e378ae9221310a14c75e911e4645

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