Malicious PDF — malware analysis report

Static analysis result for SHA-256 27521f454661f3db…

MALICIOUS

PDF

93.6 KB Created: 2021-03-13 20:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1115baf41be189f1d65b4c6c12c5e65 SHA-1: e4cfa3fdf7c0dd36c600cb43e7aad4ffa3093ad6 SHA-256: 27521f454661f3db95a70df84cde92ab582faf72926ba47b53ad3d66e6b22f95
136 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document's intent to trick users into downloading a password-protected archive. An external URI pointing to 'https://pelibifir.ru/award?keyword=certificado+medico+sector+salud+pdf' was extracted, suggesting a phishing lure related to a medical certificate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/award?keyword=certificado+medico+sector+salud+pdf
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6021d178c23a2.pdf
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5fd09a2b9ef6e.pdf
    • http://nuverlites.online/adobe_acrobat_xi_pro_setup_download7tj2q.pdf
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6020d59dba9a4.pdf
    • https://cdn-cms.f-static.net/uploads/4408881/normal_6036571097fd9.pdf
    • https://cdn-cms.f-static.net/uploads/4378827/normal_60352ec3eafe3.pdf
    • http://doctora.club/jorulukojut6iim.pdf
    • http://kukushka.space/marobaluduxrodc8.pdf
    • https://static.s123-cdn-static.com/uploads/4426549/normal_5fec0b93d063d.pdf
    • http://whitecheat.xyz/rupanoxadepisufod58arf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sidepojedava.myartsonline.com/best_application_letter_for_a_job.pdf
    • https://uploads.strikinglycdn.com/files/5cdff966-bad0-4b76-8744-6b673e8772e0/videgixojanefemirololude.pdf
    • https://s3.amazonaws.com/zifilobesumafi/iot_project_report.pdf
    • https://uploads.strikinglycdn.com/files/cda188e6-c8f5-4945-840a-8d84d9744ef8/new_testament_chronological_reading_plan.pdf
    • https://uploads.strikinglycdn.com/files/69ec8939-56ec-410f-a1d2-00bcee82d089/96429403541.pdf
    • https://s3.amazonaws.com/wobuzisibal/geometrical_isomerism_notes.pdf
    • https://s3.amazonaws.com/pipaneku/91926287889.pdf
    • https://s3.amazonaws.com/fajujiju/18706510414.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f14.bin
fc5d7261a77462c73a364c6ac772bd2d2fd15eecb2a9a3e4de4b2fdd052a5a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 5208 bytes
font_01_sfnt_off000140af.bin
dfbb17be88613587cebd035566521148a564746693d115e59d0b538766ed91a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 12016 bytes