Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4fcd3298d76ecd…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 05:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 06c98c9c9db9d824372a3e45ce1e80ad SHA-1: 2f19162adb4571d1ae7834f76f67bdf622cebe4c SHA-256: 1b4fcd3298d76ecd3bb209d63db6d6577b4cd2c64bdbffcd4bbde01f6d07cf7e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to known malicious redirector infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains text related to urgency, suggesting a phishing attempt to lure the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=how+to+turn+on+hot+tub+heater In PDF document text
    • https://cdn.sqhk.co/koditisalupe/IrHXjem/pupoguwigipixem.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/ghbAIjh/33917489016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_603bac7770d8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_603544aaa43a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_604109a99d7f3.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/aQhehb5/occupational_health_and_safety_degree_colorado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_6051bedd3d03e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muresapidun.epizy.com/fukijifofa.pdfIn PDF document text
    • http://lapabogi.rf.gd/65677255429.pdfIn PDF document text
    • http://zubidoziradep.rf.gd/sm-t230_change_battery.pdfIn PDF document text
    • http://zabewozokoxunej.epizy.com/16329805950.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/sibepuzawirugejotan.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/lee_child_make_me_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/datalinidozivib.pdfIn PDF document text
    • http://puwodadivuxasaf.epizy.com/rorixej.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/penanadu.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/35107646601.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/49450675746.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/kisibifozoluseduk.pdfIn PDF document text
    • http://pixudavevenute.rf.gd/jobativuxuzegitob.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_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 4756 bytes
SHA-256: b61f00b635c6af8e4a721c7956ce30081f969e7992b7fe4f1e5de0c6a28eb42a
font_01_sfnt_off0000feb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB3 10992 bytes
SHA-256: 0603c2a37b53a1c6a91b229a7d2e561d7b8a5b5a02054882f8f3125c66b54cf7

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