Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaef21ee011d0af…

MALICIOUS

PDF

72.2 KB Created: 2021-03-28 20:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 33d949b70319ae2a9bb0c1c952a856a2 SHA-1: 8e48ddb1932218e7b188f3af777b7b5a6611f7ce SHA-256: fcaef21ee011d0af701859fd6a910cb5028babdc222dc69524e41e8c022f8c77
96 Risk Score

Malware Insights

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

The file is a PDF containing a malicious ML classifier score and ClamAV detection. It includes an embedded URI pointing to a suspicious domain, likely used as a lure for users to download a file. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be part of a phishing campaign disguised as a free download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/wix?keyword=let%2527s+pretend+this+never+happened+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475992/normal_6025af9ed022a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5ff7d13a8e5ff.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/C3ihgeQ/1162574837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378410/normal_6005fb48176a0.pdfIn PDF document text
    • https://cdn.sqhk.co/mumepefofise/giUvij8/color_theory_questions_and_answers.pdfIn PDF document text
    • https://katebobuwusa.weebly.com/uploads/1/3/1/3/131384636/0ce1c33cc.pdfIn PDF document text
    • http://jarowulizose.sportsontheweb.net/how_much_does_staples_charge_to_shred.pdfIn PDF document text
    • http://mopewogubit.getenjoyment.net/zedufa.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/9ljhjem/motumanapewoz.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/xovujonuwolafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_5fe89adeabf2f.pdfIn PDF document text
    • http://tetupamino.mywebcommunity.org/18395387478.pdfIn PDF document text
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/32f2b5a6f5.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/9418516.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/kaxukok/causas_sociales_del_bullying.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/speed_distance_time_graph_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/36111512137.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/kikuregaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496701b7-62bb-4258-a0cb-9f1034498bb4/29829931422.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/binks_sake_violin_solo_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9e7fb7-9ef5-4f1e-93b9-215ca7976924/35539100362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891dea48-9182-4315-8dba-506b02f4cbf9/itil_service_strategy_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289c23ac-75ca-427e-b0ab-54123bbc1a80/57794989714.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 5256 bytes
SHA-256: 77d436139eff4a9938a2b3145a705600393f0fcd8615bf106ece0d69826cc2a4
font_01_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 10480 bytes
SHA-256: 979f92c78c90a63f036d8c1e43aa55eddd76773c009fa9095e127ada671970af

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