Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a05ff76ff278067…

MALICIOUS

PDF

120.9 KB Created: 2021-04-13 18:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 03c6675b8ad9c5c787bba8d58f5a86e6 SHA-1: d69b8980e444e2cd6057aafeb876c568416177ae SHA-256: 4a05ff76ff2780673ac01394264f7bab92381ea0552deb95ac920060cd3d0cbc
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. The document body, though heavily obfuscated, contains keywords that appear to be used for SEO manipulation to attract victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=directv+genie+mini+model+number In PDF document text
    • http://silekutum.medianewsonline.com/black_s_law_dictionary_deluxe_10th_edition.pdfIn PDF document text
    • http://zigitodaxepugi.22web.org/49999661923.pdfIn PDF document text
    • https://cdn.sqhk.co/nananava/ghijg1W/script_to_find_dependent_objects_in_sql_server.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/mirozivelo.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/deretuxoreburanejone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_6048ee47b6847.pdfIn PDF document text
    • http://tovarajuxelogag.iblogger.org/cbc_manual_differential_interpretation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5fdd077fe3e92.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/SjcuA8t/5633296613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_605eeb212f888.pdfIn PDF document text
    • https://cdn.sqhk.co/waketeni/dTghhe8/best_mexican_made_cowboy_boots.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403531/normal_5ff966543339d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwununigu.epizy.com/tremere_clan_book.pdfIn PDF document text
    • http://zujisofivo.onlinewebshop.net/surah_baqarah_english_translation.pdfIn PDF document text
    • http://ditonumu.epizy.com/is_jojo_part_8_canon.pdfIn PDF document text
    • http://pevoxino.epizy.com/97232580431.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_668ad828f8ad49018edb65a70e5dff03.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_84684c92927a48f4951be0845448c09f.pdf?index=trueIn PDF document text
    • http://gunijeru.rf.gd/template_bootstrap_company_profile_free.pdfIn PDF document text
    • http://xirotowukutizu.epizy.com/industrial_automation_definition.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_off00019c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C28 5072 bytes
SHA-256: 983b10b78de03c274f1a5fe1a4147b8aa1d364c86909f4fdde8a24cf43ca3e8c
font_01_sfnt_off0001ad5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD5F 12048 bytes
SHA-256: fe43b7fe6644a4d3f7cd883dc0cfbac0d0589e2cbf339a3140a75e35ba6a2808

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