Malicious PDF — malware analysis report

Static analysis result for SHA-256 2785256c500b69be…

MALICIOUS

PDF

73.0 KB Created: 2021-02-25 11:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 51dcb57d9f6261b2b7fd9af6ae833edd SHA-1: 331bfa39e9509b6a5e1c5f3e068b70a1c70765ed SHA-256: 2785256c500b69be446844ce3624e6a1a24834c939b8bb130a41d4d6cce7c08e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://yafferge.ru/wb?keyword=infinix%20note%208%20specs%20and%20price%20ph In PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/b0756c6ff751.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/rbhd3VT/subwoofer_bass_app.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/a3fa80072ff5.pdfIn PDF document text
    • http://trokot-newshop.online/92018338445ig5ua.pdfIn PDF document text
    • https://cdn.sqhk.co/nerenina/ijfhchb/tederep.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/83724734818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_600f025e4a09c.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/32809843651.pdfIn PDF document text
    • http://chelamela.org/crosley_briefcase__cruiser_record_player_replacement_needleklc04.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/vinogamolapete.pdfIn PDF document text
    • http://jilet1.club/najekofovuvebusedizobfmnxp.pdfIn PDF document text
    • http://siteznakomstv69.space/pacific_fitness_zuma_home_gym6gao0.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/what_are_the_elements_of_crm.pdfIn PDF document text
    • http://copyright-helps-team.com/building_a_homemade_shooting_bench4pg8e.pdfIn PDF document text
    • https://nibonitet.weebly.com/uploads/1/3/0/7/130776737/xatalozizofi.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/go_to_market_plan_template_powerpoint_free.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/kepobuxujolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/tiger_rice_cooker_jbv-a10u_instructions.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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 5412 bytes
SHA-256: 07919fda5ad75d177fa484f15e0eaf545cdad37611ac1ace6ab1475dbc2e72eb
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 11748 bytes
SHA-256: 45291c83d8a7c1934218e1cb25f47fc32197b5097c96a9e932686a4d61185a0b

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