Malicious PDF — malware analysis report

Static analysis result for SHA-256 1881c9b9c1f57ed9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-25 23:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4c95ebe2214aefb6e188d56de9a0f1a9 SHA-1: dce573b1146a9abcd6386952e73df0633d59c906 SHA-256: 1881c9b9c1f57ed9dab491a6bb590068e80e94dc62b8372bfb39c551f67b1b1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/aws?utm_term=romeo+and+juliet+full+book+translation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fdca897f1198.pdfIn PDF document text
    • https://zewobukepefew.weebly.com/uploads/1/3/4/4/134485556/9674143.pdfIn PDF document text
    • https://nutewoxob.weebly.com/uploads/1/3/0/8/130814783/lasikut.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/lififapeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463824/normal_5fd12bf5a8b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fe8fddedd49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_603c066649579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_601d283e2b226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_6048a7d83c38d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_007dba8ffc3c42c99e53290ad65585ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/aux_cable_for_car_android.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_07e9ce2478de4acb89f040b4b3108e0e.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_6b12708c5c7c47a2ae2bb0a741f678d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulujono/best_rode_videomic.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/quiboloy_stop_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/fitixidezasajazuz.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_b74db722b3184f0e8a928456bcc08e1c.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_198f878a9bde4514895f41d66b405b0a.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_00d569a9242e438f9b11882df5be4aa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vokeri/breville_barista_express_espresso_machine_manual.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_fd7aae3ced9e4590b0f0abe02194deee.pdf?index=trueIn 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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5340 bytes
SHA-256: 9cdc9c2cc469519f5fbffc23bfb5505bda5b8ab01139d2a405d7545acbcbffc0
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 11272 bytes
SHA-256: 7747b2240bab7214d6fc84d3323e95ce32df955c5eda94102985bb90fd26ce4d

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