Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb89757c84b0077…

MALICIOUS

PDF

79.9 KB Created: 2021-03-28 11:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e26205a59479aad079713293ab995074 SHA-1: 7d455d1bfa30b46d0b9a11b323d6443851a3dbc3 SHA-256: efb89757c84b0077526bd966d73d212326b9b86d4536e75e903e5538b5ba0f60
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=delta+victorian+kitchen+faucet+parts+diagram PDF link annotation
    • http://lnstagramverifiedbadge-media.com/doxadobetopebexaxuwupeq8d8w.pdfIn PDF document text
    • http://heleogose.online/amgen_inc_email_formatf58gw.pdfIn PDF document text
    • http://freehookup.xyz/pablo_neruda_poemas_de_amor_largosrqf56.pdfIn PDF document text
    • http://my-favshop.online/bovugulobakafej9psy.pdfIn PDF document text
    • http://lozajakar.iblogger.org/nidoxinojavimemogenagewes.pdfIn PDF document text
    • http://tomandbxof.site/pejefumeronegugavepaxotx0fg.pdfIn PDF document text
    • http://onlinetyz.xyz/rules_for_writers_8th_edition_2016_mla_updated8fud.pdfIn PDF document text
    • http://1xbet-football.fun/94679249424pl1ai.pdfIn PDF document text
    • http://kamini33.ru/what_god_says_about_divorce_and_remarriageoio7p.pdfIn PDF document text
    • http://tomerezadix.iblogger.org/a4_magazine_cover_mockup_psd_free.pdfIn PDF document text
    • http://mavito.online/36969498810uo65a.pdfIn PDF document text
    • http://copyrightproblem.com/fundamentos_tacticos_del_basquetbol_resumen0y0gr.pdfIn PDF document text
    • http://biribekagupelu.66ghz.com/nibubanukegijexibasaparow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilejulo.epizy.com/dolelu.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/19672358571.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_8d77ce251cbd4f17b95ccf052a4fb0fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geradi/71611018639.pdfIn PDF document text
    • http://zukegavodobuxas.epizy.com/kali_linux_wifi_hack_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/where_can_i_learn_html_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/29306708030.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_18c79e69b76542b6aa5ab1c018ab8ea2.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_607aef88a1f54f6182cb269e3ecd4ee5.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_b0b79caada464ef8834a6f51f50c4bc0.pdf?index=trueIn 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_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 5692 bytes
SHA-256: 955518fab780fa750fe5bba75e1d70ef7a5d8d5cd074b3249bc6a6ae71e014fc
font_01_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 10300 bytes
SHA-256: 7525c2bdfca242ff51d6cd14aec6417f16ad1c2be3ebedf62c228349bacfd17a

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