Malicious PDF — malware analysis report

Static analysis result for SHA-256 024c81b29411c459…

MALICIOUS

PDF

73.5 KB Created: 2021-04-08 03:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 36bed74de05ec5a728416205dccb6c0c SHA-1: 5077df6d38108dff96c3ab53412763aa3e461d49 SHA-256: 024c81b29411c459db762d31d79bfbc96d562b96b994aa5f9a9ebded03b32946
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/123?utm_term=nptel+antenna+and+wave+propagation+pdf PDF link annotation
    • http://msertis.xyz/15641482439xws72.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/65490357797.pdfIn PDF document text
    • http://getbuiss.online/frigidaire_gallery_model_fghb2866pfnacjss2.pdfIn PDF document text
    • http://myyshooop224.site/learn2serve_tabc_answersiokrj.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/23633792539.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/free_compare_and_contrast_examples.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/75404274617.pdfIn PDF document text
    • http://studytogether.fun/49111621573s7f19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwosagamivi.myartsonline.com/82048151938.pdfIn PDF document text
    • http://pumikowexudat.onlinewebshop.net/name_a_star_certificate.pdfIn PDF document text
    • http://verepuremi.rf.gd/investigative_interview_techniques.pdfIn PDF document text
    • http://kunipotow.epizy.com/82977220938.pdfIn PDF document text
    • http://tokewaperomuveb.epizy.com/85858478179.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_b178c97f64004ed2aa7d3675a88b8edc.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_5617db648259436d87289d0e0fb3de4c.pdf?index=trueIn PDF document text
    • http://palelezugob.onlinewebshop.net/what_do_bbc_weather_icons_mean.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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 5152 bytes
SHA-256: aff745b92bfd73d94208b122327b38bf0eab9958dae7403a9eddcec4fbe8e23e
font_01_sfnt_off0000f446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF446 10836 bytes
SHA-256: f3c2a5871ff2337c1ff942d3c344a76d64744fba323c46700c377c1aaf46516b