Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd4066afc70a256…

MALICIOUS

PDF

80.4 KB Created: 2021-05-23 15:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: baad1ed1394a72c850a5ce828e56af15 SHA-1: c8c3c3c18442fd9345fcc84bd6984dd6752e891f SHA-256: 9bd4066afc70a256364ecb67ae141510566ceca114a9bf5f6ecad632ad7e2e4f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, which is likely used to host or deliver a secondary payload. The presence of a 'download button' heuristic further suggests a social engineering attempt to trick the user into downloading malicious content.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=phet+computer+simulation+activity+acid-base+solutions+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412377/normal_6062bf074ee5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403683/normal_5fed3d117a9b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_602434a0acc29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_6057c5d6e7018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60305c1db27c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_6069105d650f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_606be0104b7b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5ffe456d9a937.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/fa930e4d-7542-4a04-a6c8-313e40062655/dante_paradiso_canto_2_riassunto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13da7ebb-8d41-493c-87d9-8d8969bd0bcc/ti_82_vs_84_plus_ce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dce83d4-4ff8-4fdd-a9a9-5acad1defb2a/what_does_blood_on_eye_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6625fd8b-eb14-49ee-be65-a0a24970dd6b/sleep_eric_whitacre_brass_band.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/malibu_transformer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39daaba6-4350-4639-bf81-f1136008720c/53835017501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcc769c-201b-4044-a802-8609e0d18463/31709684780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec498e26-6c50-47e8-bc73-edd74a64cd94/ridgid_miter_saw_parts_ms1065lz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46461fd7-1a6b-4977-bc34-5c66ad4c5b42/tilanajune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ea3167-5bfd-401d-ba39-a68e53233a2e/pokemon_gba_rom_hacks_with_dragon_starters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d799f3e-6df2-48e8-ab37-fe4622065427/breve_historia_de_espaa_cortzar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158dfeb4-ddbf-436c-b8fe-b905085ac510/53613950361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef38c5d-9fc0-4c94-8829-452d3a098bc9/masefenozujumuto.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/42531048731.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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 5740 bytes
SHA-256: 70e0bc91ed552996c1097f926b52fd400f3fa6b59ddceb3e9c339a803e635175
font_01_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 11284 bytes
SHA-256: a6a715a8798a36694d9359e65b1d969297b1411f2d6caf1937510d4eecf9efcf

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