Malicious PDF — malware analysis report

Static analysis result for SHA-256 e593e4572c95357c…

MALICIOUS

PDF

78.9 KB Created: 2021-02-26 04:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b926dccc393759d6dee77d17fb67b8a1 SHA-1: 7a86ad005fc4a3ca93775bea84fef9afbf5623d5 SHA-256: e593e4572c95357c4a452407315d00df498833df56997dc9e173a6bc96afd37e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a product name, which may be part of a social engineering lure.

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://druttle.ru/123?utm_term=air+force+1+shadow+se+casual PDF link annotation
    • https://cdn.sqhk.co/miburixegapu/ijhifat/zokuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_600dd940322d7.pdfIn PDF document text
    • http://zavodtriumf.com/solelexademezuvipabexan57h7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_60066e504abab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_601d19a858eed.pdfIn PDF document text
    • http://interstart.online/green_clinic_playa_de_las_americas3xfo5.pdfIn PDF document text
    • http://polfact.site/xudegafopilukuzifma8ai.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/69665386694.pdfIn PDF document text
    • http://vinnipoh.fun/ludulewowopiluxujuwogac6xb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_6013d611ef2a0.pdfIn PDF document text
    • http://prizinsta.online/appassionata_3rd_movementh093h.pdfIn PDF document text
    • http://potolkilife.ru/953492859669yw6e.pdfIn PDF document text
    • https://cdn.sqhk.co/jafipago/yjeRzif/chocolate_covered_strawberries_without_microwave.pdfIn PDF document text
    • http://ijmalan.xyz/tejuwavikusaj0e85.pdfIn PDF document text
    • http://am-sound.ru/the_culinary_professional_study_guid0af6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_5fd3b07f19efb.pdfIn PDF document text
    • http://ogranicbio.space/86261128078flsc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 5244 bytes
SHA-256: b3d6ff54f5421a94e7772cd9e0dc8edc8fa3278f38514d07aaf51b1bf63bd04e
font_01_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 10596 bytes
SHA-256: 0ad454cdabacd2d23ebbabddc58d47b9d056753351ad441e485a1e5c3316018e

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