Malicious PDF — malware analysis report

Static analysis result for SHA-256 1461d81853102eb3…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 21:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b07090859b778e2758875c8d3221c702 SHA-1: b1b3f3bed7552ee549fdc0afb79e78c95956b1ff SHA-256: 1461d81853102eb383c2942049b6feccb9f968e227b9d085ca09ceb11b8f56db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=best+knots+to+know+for+boating PDF link annotation
    • http://lovechat24.club/vewoxuxesivubajirezivasate4o9.pdfIn PDF document text
    • http://contarinihome.com/wilipakuragul497j.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/8236204.pdfIn PDF document text
    • http://instapriz24.site/mujodibovrcqts.pdfIn PDF document text
    • http://pl50off.info/gpxplus_exploration_guidehitc0.pdfIn PDF document text
    • http://canonsburglake.org/best_books_on_mental_toughness_in_sportshgruy.pdfIn PDF document text
    • http://bijakolonan.iblogger.org/feforap.pdfIn PDF document text
    • https://tujalulu.weebly.com/uploads/1/3/4/3/134382228/tewer.pdfIn PDF document text
    • https://pilinosaw.weebly.com/uploads/1/3/4/8/134852056/somojuzenel.pdfIn PDF document text
    • https://koniwosusuzese.weebly.com/uploads/1/3/1/8/131856176/fa44983d4060a.pdfIn PDF document text
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/469e0d0099c8.pdfIn PDF document text
    • http://italiahot.space/why_are_viking_appliances_so_expensive1ainr.pdfIn PDF document text
    • http://piredvizhnik.com/padidatimimawoy27nr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jafimelivif.rf.gd/dolufavimegesokiwevipukub.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/7470021155.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/47865239267.pdfIn PDF document text
    • http://birelasali.rf.gd/14137084750.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_1b76bcab438743cfbea97a5390121e39.pdf?index=trueIn PDF document text
    • http://retelowanudugut.epizy.com/89050245016.pdfIn PDF document text
    • http://balukop.rf.gd/50986407936.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_d0d6c67590b442e49030089dd4624c9d.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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 5248 bytes
SHA-256: 3c646c905b563365a6bf86d480554706bda45a249833d78e6285a8784c3d876c
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 10556 bytes
SHA-256: 15847643c6b9c894470099d9f6d58f960c181127a77a11da5ae5bc4b5314d31f

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