Malicious PDF — malware analysis report

Static analysis result for SHA-256 680d7f5a04879050…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 06:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8aa223b9117b78260991af0c57ee0e92 SHA-1: 0720d5c771145805c2aca3ec022bf8a02047763e SHA-256: 680d7f5a04879050d0b0e8e97ddec827a415d5c6e41b555442fb252a7eeeb72e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicating an attempt to execute code. It also features a link farm with numerous disposable URLs, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://jindi2010.com/uploadfile/files/4095022360.pdf In PDF document text
    • http://ibtaker.ps/userfiles/file/pirikajijavobe.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/wuragifuvela.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/6812096030.pdfIn PDF document text
    • http://safarang.com/basefile/files/muzimozumopexaxitajabepif.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/66706778870.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/24266473278.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/59921568862.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/25914203048.pdfIn PDF document text
    • http://evola.it/userfiles/files/podulimusawukomupi.pdfIn PDF document text
    • http://vswet.ru/f/39468381851.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/9400913332.pdfIn PDF document text
    • https://premiersuli.hu/files/files/28732893315.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/37995264813.pdfIn PDF document text
    • http://maidichike.com/upload/files/76995568044.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/72167130368.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/rugeso.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/31476239238.pdfIn PDF document text
    • http://cartopack.com/Images/file/wemonadutogedotuligegujar.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383fdcdc44c---jametawodaj.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zilagenodijulib.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/47607595616.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613378231e433---88605296842.pdfIn PDF document text
    • https://turbooto.vn/upload/files/zapopiminubi.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/xitomezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+install+certificate+in+chrome+androidPDF 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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 10820 bytes
SHA-256: 9df77b5488c63c56b9c35b47fbd03a7d5afcc75395c4611c0c49e272e96aaf10
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 17492 bytes
SHA-256: 02e2f24854c355631bc5a222378e0448d5b9f41a5641c4d19c241da7804f4fe6
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1