Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bd100dc7d142e4…

MALICIOUS

PDF

88.8 KB Created: 2021-04-12 05:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 39257bf14ca68eca10b54bd9e486168a SHA-1: 55388ae70be4f4f0051a562a804398a008dda2b9 SHA-256: e1bd100dc7d142e4f6965722de554fd9331478af9f5252549071a1db232622c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=how+do+i+create+a+healthy+meal+plan PDF link annotation
    • http://sekejibugu.iblogger.org/what_are_the_two_types_of_buddhist_meditation.pdfIn PDF document text
    • http://mivukiwoluwuj.iblogger.org/makalah_uud_1945_setelah_amandemen.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/geTdR52/70177341582.pdfIn PDF document text
    • http://xasebilebefetut.iblogger.org/vagosekitakaguluwapuguxu.pdfIn PDF document text
    • http://vemexulitoko.iblogger.org/70887892138.pdfIn PDF document text
    • http://vutomifewomisub.iblogger.org/vetitejesilipinexulirinu.pdfIn PDF document text
    • http://bebosebe.66ghz.com/99717995257.pdfIn PDF document text
    • http://femidelinedik.iblogger.org/english_story_books_for_reading.pdfIn PDF document text
    • https://cdn.sqhk.co/xekixuzurim/hfsIgBs/70046815574.pdfIn PDF document text
    • http://mawiratuwulu.iblogger.org/28482840853.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugidozu.epizy.com/afanasy_nikitin.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_886d8b3748fd484fbf877e1cf2f6d761.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_ad9f31d8df5d423591eaee82187b6405.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1285aa4d-06d9-4c43-a838-7e2ff35bd77e/29458303477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49141528-1d54-4a9e-9019-536b0fc9b571/generac_4000exl_oil_change.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_62ea8d1391e24a8b8c15d87b960f6fa2.pdf?index=trueIn PDF document text
    • http://butojoboxorak.epizy.com/wijoxadipiwase.pdfIn PDF document text
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_1d797baf762e46409c7c5238363d41b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b59134-35eb-4341-96ca-a7ad70727d96/sybex_windows_10_free_download.pdfIn PDF document text
    • http://pabaxonewopux.epizy.com/family_tree_worksheet_printable.pdfIn PDF document text
    • http://zivikabazixo.epizy.com/52600811101.pdfIn PDF document text
    • http://juwesuzibu.epizy.com/vadufozosugefoxipot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa9e670-2d88-48c3-ade1-e265da9d2df6/how_to_check_gpa_on_infinite_campus_student.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 5292 bytes
SHA-256: 8be8c82bef069057245cb2bdbf900d9d168f1b7e9860a9e2561356c0ff2f282d
font_01_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 11244 bytes
SHA-256: b4ca325afdbc01accb17b61e5a8c5b4dc00abdfa9174dc392c86b3723b275eb8