Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87fef9263c38685…

MALICIOUS

PDF

77.8 KB Created: 2021-03-03 05:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 19688d4ea649beffe87b986f6c02b3c3 SHA-1: 0f172e57307d6c07dad39ba6aa864ff923a29adc SHA-256: d87fef9263c38685440c5dcb6e6384f9067746e162ec46c7ce271846551adf4c
156 Risk Score

Malware Insights

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

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 0.9998

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://botokaw.ru/strik?utm_term=how+to+clean+capresso+5+cup+coffee+maker PDF link annotation
    • https://xoxopurotawasuj.weebly.com/uploads/1/3/4/6/134651309/zokelotutol.pdfIn PDF document text
    • http://jotelefaxomawut.22web.org/fekinit.pdfIn PDF document text
    • http://emmetrix.net/bhowani_junction_full_moviekkwpq.pdfIn PDF document text
    • http://domavera.ru/baleadas_honduras_pollo_con_tajadas9hzs6.pdfIn PDF document text
    • http://justamorem.com/car_crash_2_total_destructionajqbc.pdfIn PDF document text
    • https://fevolubepekero.weebly.com/uploads/1/3/2/3/132303134/9050567.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/biografias_de_los_personajes_mas_importantes_de_la_independencia_de_mexico.pdfIn PDF document text
    • http://defumemijiwof.22web.org/artificial_intelligence_darshan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/27675582593.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/fowararidivi.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/pre_algebra_workbooks.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/10366378703.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/zavipurogosodewimedani.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/cecelia_ahern_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/xizoxafebiza.pdfIn PDF document text
    • http://wexejobi.rf.gd/magazine_template_for_microsoft.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/gugufuwolibipikatomiv.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_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 5400 bytes
SHA-256: bd6241512b8af3d35064be07a54638e353fc319b5f623d0bad6720445f0b9465
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10832 bytes
SHA-256: ed5b67e54047c8ca6a7f7fd09da3c31bdc071ee235b8eb0ee76be1b7c496e279

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