Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb526a7d17b95df2…

MALICIOUS

PDF

69.0 KB Created: 2021-02-18 17:47:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 15e2640c34ba6d711e85e1681ee3bf38 SHA-1: dd88e379d941f5e7797355435685b584352a8f19 SHA-256: bb526a7d17b95df2520209b976acceda755b71bf1c8c971a7ccafd734bc6b864
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation. No scripts were extracted, but the PDF structure and URL patterns are highly suspicious.

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 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/strik?utm_term=singer+4452+heavy+duty+sewing+machine+walmart PDF link annotation
    • http://baykamif.space/18823574913twrfs.pdfIn PDF document text
    • http://fisijowizaraxot.iblogger.org/factorio_guide_oil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6020fc4fbafea.pdfIn PDF document text
    • http://ital-tess.space/australia_crpd_reporta6qja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410985/normal_5ff54e6729f4a.pdfIn PDF document text
    • http://jumbochecker.com/25100483314ymfyz.pdfIn PDF document text
    • https://butemupow.weebly.com/uploads/1/3/5/3/135338881/domefamek-sidumaken-pusamoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481272/normal_5ff765746bf89.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/nipidenuk_vobiv.pdfIn PDF document text
    • http://bestsalestoday.xyz/751925908650hi73.pdfIn PDF document text
    • http://politach.com/earthquake_worksheets_for_middle_school3uauf.pdfIn PDF document text
    • http://storeyou.store/nitawegatajinawimugnmcz.pdfIn PDF document text
    • http://aycotoro0.xyz/wonderful_tonight_guitar_chordsgy6do.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/d76c08.pdfIn PDF document text
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/larunusina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gejofizax.rf.gd/log_tables_maths_ireland.pdfIn PDF document text
    • http://vikomalagojuv.epizy.com/muddenahalli_school_application_form.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_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 6052 bytes
SHA-256: 3b82b56f48283888b6e83207d01143d781359cc989afe5816416442345d609f6
font_01_sfnt_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 10472 bytes
SHA-256: 8b1be39e8cec5517009f630eb5caa4d322d9d99a339c5cf155549cd3df019a0b

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