Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd22490638fdadd4…

MALICIOUS

PDF

83.0 KB Created: 2021-10-07 04:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4bbe1923e89b03410e3a56a06e50f45f SHA-1: 4a8135668d105e213661dae4db01863645f3a098 SHA-256: dd22490638fdadd42df6ddc3e253f7ace10d909a1da9b1aaf4f261ea3a5421d0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to one of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/dozilugagetigoga.pdf In PDF document text
    • http://firmen-bekleidung.at/userfiles/file/rapesajutarorevixom.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/75894042281.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/56371102125.pdfIn PDF document text
    • https://drlanda.hu/user/file/feterorefefejifibajira.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/53485852404.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zurikapikotabepuwimaxi.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/62571694661.pdfIn PDF document text
    • http://neuroxl.com/images/file/mibagumabatabenorozu.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/31973661757.pdfIn PDF document text
    • http://glassick.com/userfiles/file/2257616093.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613790743eebf---dalisopawisiti.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/nuzofapuwupovalofibaka.pdfIn PDF document text
    • https://solturism.ro/images/file/51216451446.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lekerijidune.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/96206809620.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b65de864e0---pixepefawad.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/16250796090.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/55272130270.pdfIn PDF document text
    • http://cmtsport.com/pliki/dodusegabiji.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/7650372039.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///95618326615.pdfIn PDF document text
    • http://badgerhillfarm.uk/lezitadet.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/gemonofasevidepev.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/rowinowumafumobujimexu.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/fetiguvixig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=words+to+describe+lovePDF 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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 10296 bytes
SHA-256: ad47072bd3686fe986db7176d3f83da0b868819c5437ecec01fa135081a24d70
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 20648 bytes
SHA-256: 76e50ab02133bd4d11bd682ce87f554059c9668daaf6c1df8e9157ec95fba601
font_02_sfnt_off000125e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1