Malicious PDF — malware analysis report

Static analysis result for SHA-256 2585611238d80f71…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 20:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba5f3a86d42379f32baf8817c8cf992c SHA-1: 2e0d9c04988c25e7830908542da64b00aa945c16 SHA-256: 2585611238d80f71b4e1e724c872f59f58ea9f1ab81fa05ea2b5eda875e7c471
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://cructi.ru/uplcv?utm_term=iphone+ttf+fonts+for+android PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3b56e647---dabojexozoxurisu.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/88043721386.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/90619503670.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/wapaxibebutarefilusiv.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/wavowopimodejunozapaliz.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/59227446370.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/joluxowela.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/tuguwadugibizetoda.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210909065057_1096156757.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/wutulegusel.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/naxavu.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/84576675251.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903143158.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/faxetimakara.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/59688047328.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/walolofirowolim.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/73402782915.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/wiguvopopujawomuramobuwe.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/85818063773.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/fikanerululuv.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/jufixodukagov.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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 18080 bytes
SHA-256: 9ac8309246b983467d0dd6c4a9e2ee56f6f8ce7c81a3cee7dc4b880da147c3aa
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 10500 bytes
SHA-256: cfde0d853d7159c338d565373715418380e0edf7e45a22244d300e6f72b1d1d0

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