Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fa2704b4cdc0f4…

MALICIOUS

PDF

75.6 KB Created: 2021-02-19 08:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ccaec2afc4209368a3925e9f8ee85979 SHA-1: cccd37ab2d777666406ee6b65259b5816003926c SHA-256: d5fa2704b4cdc0f4425f679fa5227d00c4bcf9df2cd620f625febba412924be9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm designed to appear as search results for educational content. The primary URL, 'https://leonvi.ru/wix?keyword=world+war+1+worksheets+free', suggests a lure to attract users seeking free worksheets. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/wix?keyword=world+war+1+worksheets+free PDF link annotation
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/65dd8d0b581cc.pdfIn PDF document text
    • http://pixell.store/penugaviex9wp.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/eb324098d1.pdfIn PDF document text
    • http://yatvoyya.fun/form_4_letter_word_from_brand8y72n.pdfIn PDF document text
    • http://premial.su/1984_study_guide_questions_and_answers_part_2kg0en.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_602f398684ac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe46745c3192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_6005e71ac9041.pdfIn PDF document text
    • http://handler-autoscout24.com/napegovodebukazigagz477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500895/normal_5fcdd1fe48f19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390095/normal_5fcece15bd81d.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/3404ca4e09a.pdfIn PDF document text
    • http://cashfree.store/7938740905k6lwr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://podepabat.rf.gd/chelsea_v_sheffield_united_match_report.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/barbie_princess_charm_school_uniform_costume.pdfIn PDF document text
    • http://gegokuberil.rf.gd/asus_vivobook_s510un_manual.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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 5216 bytes
SHA-256: 028e3ec20019eb6881023864c9227c2f1a02b829729a974a7edd64120a59282e
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 10000 bytes
SHA-256: e44c2fefc018b3bd967a1e6f8c75a0a06f86645eb37f1ed13d221e6f19dca426

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