Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c26d3adf65d408…

MALICIOUS

PDF

86.5 KB Created: 2021-09-10 18:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae442f3b82d3c58e342a12af6dc68598 SHA-1: 18a13606faf50ef2a25f39265554bc608ba398b7 SHA-256: 01c26d3adf65d4087b4a52ffc8045b659837b0e042544e7e24ef01fa2bb8688a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple unknown URLs suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://theurbanbazzaar.com/userfiles/file/vuzajawidivavamag.pdf In PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/petugepijovurumefirisuro.pdfIn PDF document text
    • http://jadeite.ru/images/file/dakixajufigoxu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9bc1dd7c---29065728156.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/lizafapijekuxazusiwim.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/juzokasidibejadoj.pdfIn PDF document text
    • http://bienbao.net/uploads/files/94590894833.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210905_215230.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/pekinovujotabafupefovobow.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/28015292834.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/sevavepomosefolavosi.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/tewametuzosuwiteke.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/buzekat.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161325b9cbffe3---kukoveweba.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/30414690833.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/bejarozikibamiwodatefare.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/73886970192.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/gepige.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/bewewaluzefeboxuk.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/fabam.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/52977898438.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/75008050368.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/51323700283.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/83129821570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=smallest+country+in+the+world+by+areaPDF 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_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 18056 bytes
SHA-256: 25e8a431e23ae504966c70de03fb8ff56ba013d1ae283717f8c775cdbfaa6232
font_01_sfnt_off00011a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A28 11152 bytes
SHA-256: c39bfb2a613b594a713fb5f7896e85bd8df264fa3cfc64e25c525664537b61ab
font_02_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1