Malicious PDF — malware analysis report

Static analysis result for SHA-256 466af2bc9829512b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 21:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 233a22fca7a5999df9449b01b50ae4f1 SHA-1: 39c68e8094ed5687e011d226858407d12f7e7a87 SHA-256: 466af2bc9829512bd10e70412d5d9572dd9ecdc1669508d571066efd7e72ff6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=minecraft+pc+download+android PDF link annotation
    • https://privatecambodiatour.com/userfiles/file/didolijex.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/86496169479.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/5562378725.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161426d55715d5---52007525545.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091614561557.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/37354491807.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/14150706488.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/talujinupowenuwamajunep.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/surawikejemepanakulido.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/30617058360.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/vuvokazadudabekafudikux.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/tawax.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/giduxirifiv.pdfIn PDF document text
    • https://angem.fr/userfiles/file/xugivebojonaperarovi.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1643206200613b85bc3e39d.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210905_3D3E00F9C3C7864B.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210914021240_pawpbt.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/bojerasaziloje.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/pikatipixigujigagixute.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7d88ed447794f8db94cf7dc0129acebc/fibevabomasibun.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/kotajuzedolire.pdfIn PDF document text
    • http://erictex.com/ufiles/files/duvitasunevixugivabafif.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/51270363734.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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 16640 bytes
SHA-256: b5ce8006a74c8688c0727ddf25fd8d18ff511afaeede639b1e5cb7c5f4a90818
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10524 bytes
SHA-256: 11ab81c8fe31ec38c05e9f62853caadf42b83107fb1dd8b17166673c0bf3d28b
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1