Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa5bfcecd85d231…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 14:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ea5e4dd72c537bbdfeaf19939a77ad1 SHA-1: f362d2a7343b61d6b5ee4d8fcc11286eff2fb804 SHA-256: 2fa5bfcecd85d23169cb7007c43bb46711f2e79ceb9f8f80c39416ad4a426868
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristically identified as a random URL and another as part of a link farm on disposable hosting. 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 linked URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=free+trial+credit+card+generator PDF link annotation
    • http://119pump.net/d/files/61613277095.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/birexorononaridisabejup.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/nidal.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/tuxipidisizewo.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/84132247268.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/senopajituvikurojome.pdfIn PDF document text
    • http://sov.tranovice.cz/webpagebuilder/ckfinder/userfiles/files/kafupolegutumunapefilagi.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/17017898826.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091121230079.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/51142123474.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/rujamufivut.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/libebetibusan.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/42125549915.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/kotewuzosabima.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/87704669029.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/faxokonu.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210903182033.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/xulurovofixolowi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a9a641ff0ef145fed73e1678fd4808db/vimodetukinaw.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5c2a8ea2b---vanozobigiketo.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/fezasujojiwarila.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/binadajedikaxafufufo.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/katejixovunofupekev.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/86037392015.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_off0000b215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB215 10356 bytes
SHA-256: 09add34a1292e76c940c6824ad4bf10ddf397aa6ad7e58fc0674bc58012a38f8
font_01_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 15528 bytes
SHA-256: 4f444d37bc85b3eeff168cceb627b823b7ff00c007b516a2b08396e23fe8758f