Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a590b47e145565…

MALICIOUS

PDF

76.1 KB Created: 2021-03-20 21:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a542dc2038fa0c39a8530724b9c86f2 SHA-1: 76cc710e4035eb143f6acef6c9925e2bbd6d178b SHA-256: 54a590b47e145565ae960b31d553f7cb2b93eafabde8752ebbd2af9f8aac0666
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious websites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=is+a+vibration+plate+good+for+lymphedema
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/gadapodikodotulis.pdf
    • https://cdn-cms.f-static.net/uploads/4486550/normal_5fd9bff8086ff.pdf
    • https://cdn-cms.f-static.net/uploads/4420911/normal_5fdaf239dc031.pdf
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fecf988d0864.pdf
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/0cb9b9.pdf
    • https://cdn-cms.f-static.net/uploads/4411921/normal_601dd2c63a17a.pdf
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/ligosuravetan.pdf
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/gebipubefovifov.pdf
    • http://dazenad.iblogger.org/rent_agreement_contract.pdf
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6020fd466a506.pdf
    • https://static.s123-cdn-static.com/uploads/4490930/normal_5fc6b06f27049.pdf
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/pijitalofu.pdf
    • https://puvovajol.weebly.com/uploads/1/3/4/0/134040332/mixila.pdf
    • https://fatagijow.weebly.com/uploads/1/3/5/3/135314750/xatetoneveninajoder.pdf
    • http://gefupokilive.iblogger.org/jewavipotimuji.pdf
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/2417002.pdf
    • https://cdn-cms.f-static.net/uploads/4485711/normal_5fe9e8a2825aa.pdf
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5ff6c34e89f5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dulawazege.rf.gd/terusapobe.pdf
    • http://rukujabaxelab.epizy.com/bilogavazude.pdf
    • http://vatoduk.rf.gd/big_data_analysis_platforms_and_tools.pdf
    • http://funazowo.rf.gd/oracle_exadata_dba_interview_questions_and_answers.pdf
    • http://mipalex.rf.gd/8799913148.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_off0000e989.bin
adf2929d7c512ece59ea8f72549cda02b6f1ecfc5461ef9be4beba8aa7e5982e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5692 bytes
font_01_sfnt_off0000fcc7.bin
a9a1243b6058cd5813fd51c01a393e60b209d6700c926d56bf39e38305cff143		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 11272 bytes

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