Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf1d990b031fd9a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 18:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d968afac6f4f4997f20b96f9912e4357 SHA-1: 203c57df3b0fa93399ce15856358c33935e8c411 SHA-256: 6bf1d990b031fd9ae7dd9c8ac9d332514a35f988178ed95a8bc8dc58e21abfec
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URIs, one of which points to an IP address, indicating a potential attempt to host malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests that the document is part of a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.heksan.com.pl/file/gozotux.pdf In PDF document text
    • http://frigotechreina.com/userfiles/files/tovase.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/29123655869.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/58940882543.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/namoxoxopatezagedaja.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405b6d23ac9---joditadomutewoxusomew.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tiluboninosefof.pdfPDF link annotation
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/17695433653.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/sunedebesakigibofo.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/12371529868.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/zewigefamedageximijo.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/sadunefojegilinodoga.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/nibaxafitipamoz.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/6988895315.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4844038632.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/luderaro.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/34646241960.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/bagefaligiv.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/34758949215.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/kojilakanidoniwebesuxu.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/1596078330.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/95948610326.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/44996056593.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/jepizo.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/budugijuwerezaxerupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+trading+card+game+gba+downloadPDF 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_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10864 bytes
SHA-256: 9c376d8540fafd14d2303b2d6341bda3e9e258fc9e6d10b62f7a845dd5d36522
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 17880 bytes
SHA-256: a8d154e0b425bccc3d84ee922308ef8de1a73e53081a531b4b3e952f9687fb16