Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b987b277e7c50b…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 21:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cc71f3a5773571cf16af92611e5768c4 SHA-1: a2c80acaae662eac7897b734d1d9947fec2ac5a4 SHA-256: a9b987b277e7c50b193f05b7900cfd0d00f60260603d42ac5715e5471ae28b24
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/aws?utm_term=is+the+5.7+hemi+engine+reliable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445541/normal_601841aa901c6.pdfIn PDF document text
    • http://fevevafo.medianewsonline.com/concepto_de_neoliberalismo_en_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwosexed/fYicjjm/76899448653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417029/normal_602bb45547f27.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/frozen_juice_concentrate_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_6038215f38d93.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwapusumoge/fgiZSlq/46034715120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_6034719b2d127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_6038024057316.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/TplNtbk/89569243198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5fcb97006077f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449990/normal_5ffa73edc6fa1.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/gijezuwanabarimufivamu.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/acute_glomerulonephritis.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/lupemalopuvanok.pdfIn PDF document text
    • http://boraguw.medianewsonline.com/63919937997.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/ibsjeWK/construction_completion_report_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/supersonic_indoor_tv_antenna.pdfIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_ce6d38ca56094fad862758fedaf2e1bb.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_b588dcf27c564fa8b8d6c096b3aa0a7f.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_3e9f956f4ad84958be6d5db815e85722.pdf?index=trueIn PDF document text
    • http://zapusov.atwebpages.com/74587176361.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/sanitary_napkin_manufacturing_project_report.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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 5412 bytes
SHA-256: fa0878199dbc08139f4cd8fe03b6d6808f1f91599d512c2c186eff8ab35525de
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 11284 bytes
SHA-256: ea0abf82cfea827285fa39e0ba727ae228e2bf5c0c8b80c144211b087a1a9e89

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