Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee491a3a57f16dc…

MALICIOUS

PDF

76.2 KB Created: 2021-03-15 23:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd7f988e729696566e71d3db852fc49 SHA-1: 909b7ccb04d014c62ab2519709d325998111ca5d SHA-256: 9ee491a3a57f16dc783c7a5ace8a2d0a3a763742b10abf54302efacf6635dd57
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://soxebez.ru/wix?keyword=serotonin+power+diet+drink', is likely part of the malicious infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=serotonin+power+diet+drink
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fde6cbca2a33.pdf
    • https://cdn-cms.f-static.net/uploads/4465907/normal_5fd5efe0c7adf.pdf
    • https://cdn.sqhk.co/navotezive/dMjfiiV/88612544389.pdf
    • https://cdn-cms.f-static.net/uploads/4423166/normal_60286b29ce749.pdf
    • https://cdn-cms.f-static.net/uploads/4416331/normal_603faeaf94045.pdf
    • https://static.s123-cdn-static.com/uploads/4423696/normal_6006165491a6a.pdf
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5fdf86d65ce8f.pdf
    • https://cdn-cms.f-static.net/uploads/4459629/normal_6037bc450d91c.pdf
    • https://cdn-cms.f-static.net/uploads/4383586/normal_603434ef44a29.pdf
    • http://funasowuto.getenjoyment.net/the_100_year_life_book_amazon.pdf
    • https://cdn.sqhk.co/nanijamu/L6yiagd/5023388858.pdf
    • https://cdn.sqhk.co/tisezalave/e7gdkja/bexevumatuxuseradujali.pdf
    • https://static.s123-cdn-static.com/uploads/4461232/normal_5fe4e4bc14282.pdf
    • http://rejemezurufoveg.mywebcommunity.org/wideralogen.pdf
    • https://cdn.sqhk.co/fefamuve/7JOhhfj/update_chrome_android.pdf
    • https://cdn.sqhk.co/molivovuki/jbUPF8I/dog_pen_for_sale_uk.pdf
    • http://wusozupu.mypressonline.com/85295246965.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jatoxat.atwebpages.com/pikepafo.pdf
    • https://s3.amazonaws.com/kovilowab/tezuvane.pdf
    • https://s3.amazonaws.com/xuvamuba/support._apple._com_iphone_restore.pdf
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_ced944d75f8b4071807fbf392e07c115.pdf?index=true
    • https://s3.amazonaws.com/zuponefi/cardiology_mcqs_with_answers_for_nurses.pdf
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_58406ce81ad64b4b875c2a4419d959b9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf8.bin
c615ee2dbea902f2a0f409607c08df71ca9ad519227ea679e7a6f0b399de7d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 4792 bytes
font_01_sfnt_off0000fc6c.bin
ec8fc08c3e7944bc5947c41335819b7900184e1c4581b364edda43a21ceec65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 10800 bytes

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