Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45a557dac59be1f…

MALICIOUS

PDF

72.8 KB Created: 2021-03-12 12:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 135a30c09c4f115ed2a27b6711fe1a99 SHA-1: b065733120cd65d0c554730a122275b671239857 SHA-256: d45a557dac59be1fa132982daa036e3ab58ee01381997893fd7632874e7c3b5a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF link farm', suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+much+does+procreate+cost+in+euros PDF link annotation
    • http://pexawegowe.mywebcommunity.org/4186928942.pdfIn PDF document text
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/9691522.pdfIn PDF document text
    • http://nalowisep.22web.org/audit_report_contents_and_types.pdfIn PDF document text
    • https://ziralupaw.weebly.com/uploads/1/3/1/3/131379221/84b530a42.pdfIn PDF document text
    • http://lupupive.22web.org/javascript_reference_variable_outside_function.pdfIn PDF document text
    • https://jomagikovire.weebly.com/uploads/1/3/1/4/131408086/sajawabelubo_wimavefuxuguwi.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/60367613564.pdfIn PDF document text
    • http://sutobep.getenjoyment.net/de_que_trata_el_poema_el_viaje_definitivo.pdfIn PDF document text
    • http://vakiduweg.mygamesonline.org/names_of_allah.pdfIn PDF document text
    • http://rufisurerupu.iblogger.org/resume_template_doctor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/mafunadelemepitugutela.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/blog_de_libros_juveniles_gratis.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/biology_in_english.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/guwosalemukulatotivijaf.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/kutiwejujajazujoxiro.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/72692751104.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/fesorilopobefegome.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/87702454100.pdfIn 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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 5332 bytes
SHA-256: 11db182fa441c4af2d80f195ebaa46d1c15b0064b1ec60125604bf98f65813ad
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 11000 bytes
SHA-256: 77e715feda33e2fe8ec52c16ae78581fe4d8f66cfe1afb9d45f6797a8f1d53d5

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