Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e3d252bb2e8cf1…

MALICIOUS

PDF

77.0 KB Created: 2021-06-04 14:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 75b6800e89c27458afe608e5b520a949 SHA-1: e45794053896a7bef4bab545234a1298eaa67c2b SHA-256: d0e3d252bb2e8cf1b99c2210a1a78ea42a6c9369f480f3f52bd50c21c1a3d0ac
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, which is likely the primary payload delivery mechanism. No scripts were extracted, but the presence of external URIs and the phishing detection suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=what+is+the+true+meaning+of+birthmarks PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490950/normal_5fe1040fe8a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_60550316ea02c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_6064f4baa3c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_605018101e15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_603f43bfed1fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408594/normal_6004dce5cddc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_5fd99ea882681.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4454691/normal_60b530c7683a3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4443576/normal_60b004df18fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_605d7a9f493d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_60172760f1002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fdb98325361c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388038/normal_5feb3eecd3c3e.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/bc4b43be-724b-4305-bef3-16265c391dfd/99214014923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27e91c4-c471-47cf-81d6-7617834c59cb/what_are_the_3_major_theories_of_motivation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d50ca38-5a0e-488e-a82e-e59452f99289/13613637749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f32f34f-5b9e-46e9-b48c-8b2c03c6fdbf/utilitech_3_outlet_timer_instructions.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144536172/93513329428.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/144513534/birijofup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037f7148-a1c7-488d-be37-a6a160a1a425/82389144871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919e1547-fe3e-4a14-a9ca-8c7b4ae89bc8/what_is_first_order_and_second_order_reaction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0879aa-e57c-42b2-8378-1b274ae641ab/72092921444.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144509316/13905736812.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_off0000f163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF163 5364 bytes
SHA-256: ab7a20067677cc977b7c7f677c91c8b8e8cde21130291260bdb2a51eb8160f7d
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10096 bytes
SHA-256: 8abe83a749421720e12e849ae0339fb03622f3fe655123db734b9883e773501e

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