Malicious PDF — malware analysis report

Static analysis result for SHA-256 1236c50f18f7f505…

MALICIOUS

PDF

104.0 KB Created: 2021-09-16 13:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f0097935299394fd900ac3aaf319f7e SHA-1: 542da4295729cba5e594b33769066d3043f96203 SHA-256: 1236c50f18f7f505807b5f3fd4ba05c4fbd7ecbfa85d5b233cb733c3ab062dd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://nirkongrp.com/ckfinder/userfiles/files/goburadupefivovoragob.pdf In PDF document text
    • http://stin-verdon.fr/assets/Image/files/45110911397.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/68368882922.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/nenixewebirodif.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/71945825610.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/22554278862.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c0321d7ae---tafogowiwokosudabodaw.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/43794700754.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/mawuz.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/ledavukonigidatuma.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/39683043971.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210906060700827226.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/60838143155.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210907215137.pdfIn PDF document text
    • http://telecycling.info/files/file/98416483332.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/23838067166.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/88773851226.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/711b8a6a9c4bda684248055d709e913b/pebak.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/xipibodexefivivivelubo.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/refusasafopepiwidinudiw.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/22391792656.pdfIn PDF document text
    • https://proia.bg/userfiles/file/vebimikamevozo.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/votegevazofu.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/16327481687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+video+songsPDF 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_off00013193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13193 19168 bytes
SHA-256: 47fff6d5f20aae65c7b6e5db171191616abb35757940e589c2126d0546e76021
font_01_sfnt_off000163d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEB 10164 bytes
SHA-256: c33bc157bef52f77411451389084d5b2a7ce2b2e2b67d2d5e0469645af62ac47