Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fc1f133d329c6a…

MALICIOUS

PDF

87.9 KB Created: 2021-03-03 00:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 18eb14af20e465da8516dade98421d08 SHA-1: e68035dc45b904264b359525161539f5c10dad71 SHA-256: 24fc1f133d329c6aa84feefdcbd749721012179a18aa122b996c81ded45cdbda
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure (dafemum.ru). The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to deliver a malicious payload or phish for information.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=la+casa+de+bernarda+alba+pdf+resumen In PDF document text
    • https://cdn.sqhk.co/tewisifupib/jaW8FSJ/life_is_strange_2_ps4_pro_4k.pdfIn PDF document text
    • http://zifasito.22web.org/dark_knight_returns_fancast.pdfIn PDF document text
    • http://afracheat2.xyz/ac_market_pro_apk_latest_versionvp6ne.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/ijj9mhd/fegetozexafivoxosej.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/gHDgchM/2160012804.pdfIn PDF document text
    • http://bestita.space/kallax_assembly_instructions_16_cube2tprq.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/how_to_download_gta_5_mod_menu_on_ps4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/adobe_premiere_pro_cc_2015.3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/jan_cartoon_new_episodes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/nonadiwotufor.pdfIn PDF document text
    • http://donotalu.rf.gd/88423238179.pdfIn PDF document text
    • http://jaberorer.epizy.com/28602798992.pdfIn PDF document text
    • http://tafupudininidag.rf.gd/onkyo_tx_nr636_arc.pdfIn PDF document text
    • http://gakupoxefale.epizy.com/462547230.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_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 5384 bytes
SHA-256: 38b295a4e50f57ab16cd933e7303369650123a1bb9915f77fca3b3b8c1a9e967
font_01_sfnt_off00012bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF3 11336 bytes
SHA-256: c65a3a37fd1fda1a64ba29563466867eaf04cfaa2e9ccebb6f9ae33dd3376584

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