Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0eb76c4ecc0309e…

MALICIOUS

PDF

75.3 KB Created: 2021-03-27 18:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0b8c3c7470a74da493500ef3930a5469 SHA-1: f6721b0a0b98590d99f81ce96f95ba5a68a5d916 SHA-256: d0eb76c4ecc0309e3c6985ba4e0863ba0f1bc7837cb4c3a9ae7fa45c807875d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. The primary attack pattern involves directing users to a multitude of external PDF files, likely as a distribution or SEO spamming mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/award?keyword=annuity+due+and+ordinary+annuity+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459477/normal_5ff070cfdab63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_60597fab7d410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5fcaabf100307.pdfIn PDF document text
    • https://zurowesijeja.weebly.com/uploads/1/3/4/6/134630916/d18e5be1e3a.pdfIn PDF document text
    • http://doctorzlo.com/what_does_print_head_alignment_mean3d74l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386620/normal_5fcc4e4dd34fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5fe7b72e95c7a.pdfIn PDF document text
    • http://nikecortez.net/what_are_design_thinking_skills0xsdj.pdfIn PDF document text
    • https://migerele.weebly.com/uploads/1/3/1/4/131453560/ligixun_bagiwe.pdfIn PDF document text
    • http://aycotoro0.xyz/atm_transaction_failed_complaint_letter_format_sbihreuf.pdfIn PDF document text
    • http://armada.technology/how_to_install_mods_for_oblivioni78y7.pdfIn PDF document text
    • https://metelegib.weebly.com/uploads/1/3/1/3/131380803/b953497588a.pdfIn PDF document text
    • http://pearhaidhr.fun/xuxizafixqnmcv.pdfIn PDF document text
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/9481900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447912/normal_5ff869a74d8a8.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/b58fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fdc1680eca43.pdfIn PDF document text
    • http://apparently-home.com/white_christmas_lyrics_elvis47g19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ff3c62fd4f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_6058506a936af.pdfIn PDF document text
    • http://winoraama.site/adobe_how_to_flatten_commentsc5b7a.pdfIn PDF document text
    • https://dodemitewiv.weebly.com/uploads/1/3/1/3/131380707/gowerizaguj.pdfIn PDF document text
    • http://marafonsport.site/370457998272x0ni.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/nenaxenonase_lerovemikazik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 4916 bytes
SHA-256: 71a9f0ade80b3b8352935743efdcecfaa6f946f7e0a3a1884cbb8aad517d1b61
font_01_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 10748 bytes
SHA-256: a33dc84cadf8a08f489774f3979ac4d40aa2bd77bfa771c8869604cc9a29a096

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