Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e231756029a6b98…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 06:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c65ee4df468e46a11a5f16ea8122fc35 SHA-1: 65e132558ecef24221f0d09b646b0e3de1811636 SHA-256: 8e231756029a6b9856bcab95133b3e20a1818bab94e01280e3fd3b28b0b78f96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://laborke.ru/uplcv?utm_term=yify+subtitles+download PDF link annotation
    • https://synodradomski.pl/userfiles/file/wulakuluwikivunafudi.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/pozefewovizunarunoxuji.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/17820419294.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/34450812224.pdfIn PDF document text
    • http://gojjang.com/uploads/files/mujujapizo.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/juriratexekevatedoza.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/29446995063.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/gudugefa.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/33604296857.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/napugupole.pdfIn PDF document text
    • https://coluer.ir/documents/file/83779649391.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210927_072941_6690.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/muburelowigemunivabule.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pelave.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/walijajuxetaf.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161512fc15c36f---sizukugebulonagufom.pdfIn PDF document text
    • http://tobolsk.fluentrussia.ru/img/content/files/zunavenek.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/lusigivovenegewamesipef.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/lufuroj.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/gefosijevigivudoxofomumiz.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/lalizozimin.pdfIn PDF document text
    • https://eurotig.ro/file/rutinaxejakusexo.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fapatapibifumomu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d78954645---64956762764.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/98626157045.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_off0000b118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB118 16292 bytes
SHA-256: 1f475a1e2bdb1d610c4ceacc3717f3110913c37cd456755df5fdb5532c80a159
font_01_sfnt_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 10668 bytes
SHA-256: ffdb82b0043bb89a8d73431be6ed4fb09e989962a6bd12cb1fcd78ac72490c08