Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff14563b99165e8…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 09:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d61328c9eb0838b933ad8ceefa921ba SHA-1: d6e4040b0ef02f257461720d455b9da05f78547f SHA-256: bff14563b99165e8543a9a88f7501deb8c8d5a9697d4e3a712af0151d5d681d4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=pleural+effusion+drainage+guideline
    • https://linezajokopu.weebly.com/uploads/1/3/4/6/134629872/84581.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_6012432e6f452.pdf
    • https://cdn-cms.f-static.net/uploads/4472763/normal_601a9a040ebca.pdf
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/1155756.pdf
    • https://fojokelimavame.weebly.com/uploads/1/3/4/7/134713907/kusebenuka-fulegorewasi-vasex.pdf
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/8c84751a1805.pdf
    • https://static.s123-cdn-static.com/uploads/4420014/normal_5ffdc07679640.pdf
    • https://cdn.sqhk.co/xudevekelefe/eXicd7A/simple_task_list_online.pdf
    • http://biniwitovo.mywebcommunity.org/22013061880.pdf
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5ffbaf0cde39c.pdf
    • https://cdn-cms.f-static.net/uploads/4487201/normal_602ff38230afa.pdf
    • https://cdn.sqhk.co/mesafovojifo/sgjcagh/62081440296.pdf
    • https://bebedukiraf.weebly.com/uploads/1/3/4/8/134885496/tijuvunokij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lopadivupudexa/naxaduresaxonigedese.pdf
    • http://rofuvawitarul.atwebpages.com/candide_by_voltaire_characters.pdf
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_b8ee3a6541cc496f96c59ab295f974ea.pdf?index=true
    • https://s3.amazonaws.com/babetafaperaxov/tatutatupinewutife.pdf
    • https://s3.amazonaws.com/makumapikeze/84490007017.pdf
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_1446d28f169746bca0763328a6e7244d.pdf?index=true
    • https://s3.amazonaws.com/kikunojulejuj/echo_gt_225_head_wont_spin.pdf
    • https://s3.amazonaws.com/rowubunak/after_pulse_game_for_android.pdf
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_35af382d5ab14c85a87b6cd24b182b8e.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_8fe76c53dc554d71aacf84ea8468c76d.pdf?index=true
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_b860e4c629cf4a24b72266067b81dcd5.pdf?index=true
    • 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_off0000ef10.bin
f258b68c122cf81831e4aeb12fb68738ec24907bb25dd5ca8dbb209d7a15e732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 5076 bytes
font_01_sfnt_off0001005e.bin
2c49b81b47d4ace040d64e4c0979ce75b21582f11cb99acb18c624bf994f21dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 10496 bytes

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