Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ceb412ae4a90ec…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 09:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebf21739b0dbd543323287e9bc7829fc SHA-1: 1b75e229a135eaebcbc8aca417e27161795344d8 SHA-256: 73ceb412ae4a90ec59fc3dc5f602403a078797053a5fe7ce9716188cc0c69a9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, including one identified as a link farm on disposable hosting, suggests the PDF is designed to redirect users to potentially harmful websites. The primary attack vector is likely spearphishing, with the PDF acting as an attachment.

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://pianotuningdarwin.com/userfiles/files/43204068777.pdf In PDF document text
    • http://bhk-aindling.de/userfiles/files/53316450519.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/1573393507.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/kituxudusunibaduxovivu.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/58164031811.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/42435276913.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/99949014282.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210915_163AEDC9607F7CEE.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/dilixoxedunewiwuged.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/83479307627.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbcc528ca---56384922226.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/nowisud.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/86686574906.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/vatuzepevatetatowulofigu.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jivelogajopidatufatele.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/tebinobududifikovule.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/20559879410.pdfIn PDF document text
    • https://majubesar.info/contents/files/13665487495.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/77715337879.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/27471367166.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/57023963444.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/64808653004.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/depururovanunitugogegul.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/vubuwesozawo.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/61697803763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=top+f+droid+appsPDF 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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 16656 bytes
SHA-256: 23c25c22431a455d7687324326ca041d0f407460daf6a054fa8e2297e633d321
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 10072 bytes
SHA-256: 8352a81e2cd4fce81971feda4ddca83d6bd6eacb6bcc8ce5d42a211f0056691c
font_02_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1