Malicious PDF — malware analysis report

Static analysis result for SHA-256 89af423b5e3df0d7…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 13:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f50ecc6dd95cce8b02a478738d5a3495 SHA-1: 97d2253c9c60f36eac2893f10b9049647fbfdad5 SHA-256: 89af423b5e3df0d75d9072a4cf2fe33333b20a648ee36c5e77793a94a9263f76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic identified it as a link farm on disposable hosting. The presence of these elements suggests the PDF's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://xboxheerlen.nl/userfiles/file/4957611362.pdf In PDF document text
    • https://matrixx.lu/images/wikojoridazoses.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nasafutogevolanivokudew.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/76602984425.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/mizikavejabutizivezo.pdfIn PDF document text
    • http://bakoca.hu/files/file/90533501082.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/21174387227.pdfIn PDF document text
    • http://airfa.it/userfiles/file/79191845004.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/3462755548.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/45567811290.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/taruwagafamed.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/pogikusumovebaj.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/jaboxufarik.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jatowavuzagajiluza.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/sulojiwisugujejawera.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/23733485724.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/dewuk.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/35693691593.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/94012898332.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/96065143046.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/8618742812.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/rizewutowajobesowovof.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea596e4d5a---zudigosafunozebaxit.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/pinulixenotapexe.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/nabugifamuguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=coins+per+minute+pokemon+goPDF 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_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 18380 bytes
SHA-256: 4979cc48fd94e96a234d11af8e8fda2a5d0824d844fdb1b336964e9f72803bfe
font_01_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 10608 bytes
SHA-256: 636a12a5d72a066e6cfd554405d76facf20757bcea8061346ba19a2880728767
font_02_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1