Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2de8c2cd0f1bef…

MALICIOUS

PDF

699.5 KB Created: 2021-05-23 08:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4a62834f025eab8f07456d701e2f8f8b SHA-1: 920582eace71813c0cc5f312cfea83dad64f1b4f SHA-256: cf2de8c2cd0f1befbc8fc895db813738c7a03b2d70a0050fec3513e4270a7f38
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it is a phishing trojan. The document contains a heuristic indicating a 'Clipboard command execution lure', suggesting it instructs the user to copy and paste content into a shell. An external URI was also extracted, which is likely part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7476

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://mezovuduw.ru/strik?utm_term=4.1+classifying+triangles+answer+key PDF link annotation
    • https://wededizopi.weebly.com/uploads/1/3/3/9/133986349/6192035.pdfIn PDF document text
    • https://toviwapomini.weebly.com/uploads/1/3/4/7/134727984/gawukip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fe9eb371e5aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_606a9f88a3e70.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/vogiseruk_galadikavuv.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/9899024.pdfIn PDF document text
    • https://lituveso.weebly.com/uploads/1/3/4/3/134362288/sizewigu_diwakumozife_zinulevav.pdfIn PDF document text
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/1b9973192.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/gigurogora_jofifi_fikumelu_daronad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5ffc939dc060b.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/podabitoz.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/taloxed.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/e01f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_604034b4d4204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52990cff-68c6-4a86-8ff8-fcf0bc145d38/dulixinekelotaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e301af-bb63-41e9-8635-797eef53bb8c/south_carolina_permit_test_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f616ca-c3f9-4f95-a3bd-691ff94fc942/la_familia_de_pascual_duarte_anlisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e7521d4-808f-4f5e-9f46-b802e2c0a3e9/xasalobofireguzutadisag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d918ca43-7e12-4fa6-8515-ad6d75285b0c/is_there_going_to_be_a_5th_red_queen_book.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
    • 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_off000a7d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D53 5384 bytes
SHA-256: 77c7d88d1b9ee9d02a5ac258e0e8ca5bae133fd9b103a304ebe07c919f9488f4
font_01_sfnt_off000a8ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8FF0 15340 bytes
SHA-256: e78dddd7a324427f1de6e9dd5c8e473b5c07713bf893e893534c7fc0b514376e
font_02_sfnt_off000ac284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC284 16500 bytes
SHA-256: dd46e32939bec78152827fbf5dd898b141184eba991555ec167bf686c016b41c

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