Malicious PDF — malware analysis report

Static analysis result for SHA-256 256bf24c0460b3da…

MALICIOUS

PDF

82.1 KB Created: 2021-02-26 18:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 92fdac62eb6c9f0ed70614c9f21e19ee SHA-1: 6db934c61baa96965dd6e0000e4a31649324bfb0 SHA-256: 256bf24c0460b3daf673a757c4840d6039f2ec29ccd3f6aa70fd17fd35cbb8f5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are suspicious and point to potentially malicious domains. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to malicious sites, likely for phishing or malware delivery.

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 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://vilenefex.ru/wix?keyword=the+mask+you+live+in+worksheet PDF link annotation
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/milixiwemetegosi.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/48274241325.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/rubesonetokeduxu.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/how_old_are_the_riveras.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/how_to_fix_a_john_deere_riding_lawn_mower.pdfIn PDF document text
    • https://cdn.sqhk.co/dodifufim/nDtgijh/sibekagoxudenoza.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiwuximu/jcFKjcI/66543504550.pdfIn PDF document text
    • http://topsale.pro/jijiloo3xap.pdfIn PDF document text
    • https://fulesinarube.weebly.com/uploads/1/3/4/7/134729099/73bc1e318993.pdfIn PDF document text
    • https://ginamelemu.weebly.com/uploads/1/3/4/6/134624442/fofugu.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/WEiijgi/arcade1up_asteroids_for_sale.pdfIn PDF document text
    • http://mgacessoria.online/reduce_free_download7k5v2.pdfIn PDF document text
    • http://filfex.ru/91476361617lkdqi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezerawe/budget_forms_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/fiwiwas.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/aion_2_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/70941410899.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/zifafezebupuxogafafuf.pdfIn PDF document text
    • http://gezixus.myartsonline.com/71491556169.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_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 5192 bytes
SHA-256: 09d47f0e402d02f5c49dd9df1fc8b037e29281af1a81892793c9c57b8ddbff60
font_01_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 11224 bytes
SHA-256: a7332540374adad69571e50fdf146d1eb8de2d72fba9139769d3ed7140ddc440

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