Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3b789c2c73a989…

MALICIOUS

PDF

92.1 KB Created: 2021-09-12 10:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5278bb008afc53fa7664a0631c9e3d0d SHA-1: fbbc922ef619c10e2561da1a24627d864e3565dd SHA-256: be3b789c2c73a989719d88de7e149d565b50f8c2e63eaa5ba4ea0fb0a6708368
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 phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pixomot.ru/uplcv?utm_term=canon+in+d+major+sheet+music+pdf PDF link annotation
    • http://jinistudy.com/_UploadFile/Images/file/84227138507.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/wasuzurezeturunavopujo.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/62123060134.pdfIn PDF document text
    • http://dytac.hk/userfiles/33771800673.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/vajibujoni.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/wufidekalezeruzogul.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/88644811629.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/24960967661.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/ruviwerukekofovobutopi.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/72074430867.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/nusodewepemerexokil.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/puzopi.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/xabanexepatexobeg.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/topikixezebow.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/27253626215.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/tizizi.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/womimiwepir.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360255ed5ed---kivipukosopelipekafejuxu.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/061229445454.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/lukabizamaje.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387c5997cf8---14453072520.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbda14abb---retijedabotezogezuvuzona.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/gedul.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210903213309.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_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 19304 bytes
SHA-256: d4285350c1e6ce9c366d47f05817e9e971faf4e686b7a9dccc285f8e77074ce4
font_01_sfnt_off0001309a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309A 11100 bytes
SHA-256: 9132b098961035f8d9295a3f774d0a69c9f231c428c43e03eeea70d181a24126
font_02_sfnt_off00014a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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