Malicious PDF — malware analysis report

Static analysis result for SHA-256 23da399553889cf3…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 00:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 26e1010d7ecf3d463307739446b105d5 SHA-1: f22487e14e5a5757dfef83988d6690666a716209 SHA-256: 23da399553889cf3929650523dbd4f9712bbdbabd1d7473b3e0cd8a817438866
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'pelibifir.ru', which is likely the primary lure. The document body, though heavily obfuscated, appears to contain text related to a game, reinforcing the lure. No scripts were extracted, but the presence of an external URI strongly suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=play+realm+of+the+mad+god+unblocked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421201/normal_5fe4e9c4dc5c6.pdfIn PDF document text
    • http://sujovageje.22web.org/zikagovuwiditosuba.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/2KGPja1/leduladuvopibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_601baccc7d7d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388282/normal_6043613fa9b35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fdd6820aa366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446924/normal_603e2e34bcac5.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/iahThha/39644855397.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/fHgdsia/stickman_shadow_legends_revenge_super_saiyan_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/ghggjgh/konojazakemezepisake.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/hftxhji/amazon_seller_central_app_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/kitchen_clipart_borders_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/63695474796.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/arma_3_steam_key_generator.pdfIn PDF document text
    • http://vukenebavez.rf.gd/nalumimikimasojalufuviza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32fa603-423e-4d8b-b346-73c1f325dd88/rolabefurokisip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0d3da9-f869-407a-9319-2827083f0c67/giwebibopa.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/25129112484.pdfIn PDF document text
    • http://vabowako.rf.gd/systematic_literature_review_process.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_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 5564 bytes
SHA-256: 487d2f584f7c58813e0509692dc95deebaa69255969045780b0af3cef044974a
font_01_sfnt_off0001011c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 11684 bytes
SHA-256: 58856a07a94afd75189796a1a8c525d11b40dd0ddaeec9fb24419b4cd3fb0e86

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