Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a128dd14b76b658…

MALICIOUS

PDF

87.0 KB Created: 2021-03-24 03:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5d07807c8ae212bd3b8f6b013b9d85e6 SHA-1: 71ae85308018f1ee2639b91f37e434b1ae7d7493 SHA-256: 8a128dd14b76b6584769ce392940b5432a249a9c4e47b1a17677fa9351feedd3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=roller+bearing+nomenclature+pdf PDF link annotation
    • https://cdn.sqhk.co/xawobovuji/m5dPNgd/kezopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_6055c7fd2e716.pdfIn PDF document text
    • http://vasizazesunof.medianewsonline.com/relative_dating_worksheet_answers.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/mudoj.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/12919231949.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/9199396c00da90f.pdfIn PDF document text
    • https://cdn.sqhk.co/tolademapati/bMlhepM/apoc_date_format.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/air_fryer_recipes_for_beginners_pork_chops.pdfIn PDF document text
    • https://fitepavi.weebly.com/uploads/1/3/4/4/134485464/nosel.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/sony_vaio_pcg-71318l_bios_update.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/zosufudoguwox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500450/normal_601b482e7fb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453129/normal_6023d1eaae6cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_6055529574b75.pdfIn PDF document text
    • https://gesimuto.weebly.com/uploads/1/3/4/6/134685476/1067173.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moborudazijom.epizy.com/australia_visa_application_form_sample.pdfIn PDF document text
    • http://jekidosokun.epizy.com/59158371974.pdfIn PDF document text
    • http://rebobimakefeli.epizy.com/wevedewonawedodeludelex.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/kepojirevuxiputinajojij.pdfIn PDF document text
    • http://dizekalukojulap.rf.gd/jerezuganenevegil.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/vertical_farming_project.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 3320 bytes
SHA-256: f505ecf3fbbcaf6d783dacf3ec36e77427686cbbf2a9f53316e08e45dbd9bded
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 5444 bytes
SHA-256: c453a2be351875b09bee0ec465659047b9f66aec25785a117f5aba8b5dc27e93
font_02_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 11488 bytes
SHA-256: fa27e57ceec82c744b939b9286aede9514f12c946875857f741e2eea9737de8d
font_03_sfnt_off000138af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AF 16260 bytes
SHA-256: b1b93bf558ee65cf174bdde98fc70b39c77ddcfeef9d3a00758a58eb2f24951c

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