Malicious PDF — malware analysis report

Static analysis result for SHA-256 527e394e6bc226db…

MALICIOUS

PDF

89.2 KB Created: 2021-04-07 23:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7d5f7b7450887402721b2d6359996bb5 SHA-1: 6c407d9d3350068b48a38255ee6535a6968ca8c9 SHA-256: 527e394e6bc226db06be951d5e9e477f5ec72a21bac3c7806f6a50a8c5db49e3
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to disposable hosting, suggesting a link farm designed to host malicious content or redirect users. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into clicking these links, likely for phishing or malware distribution. While no scripts were directly extracted, the presence of numerous PDF links and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/123?utm_term=admin+template+bootstrap+codepen PDF link annotation
    • http://zotuvogilisori.iblogger.org/visual_basic_source_code_free_download.pdfIn PDF document text
    • http://xuzumareto.iblogger.org/mla_works_cited_document.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/K4PghpZ/nakevirozezad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_6013ce189e93a.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/2jiQugf/vector_full_apk_mod_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_5fd15aa11ef8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_604a12ce73e5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_50dbae4bdaa64fd4bc6844dc040d7ff3.pdf?index=trueIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_9e47be24ea71419a8dd87d13d8a3495b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/405fd5b0-ee9b-4af6-902a-b8b3ecd8b145/pioneer_vsx_822_review.pdfIn PDF document text
    • http://muropep.epizy.com/relusonabolime.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_fb25d86500d6479c8ede41794fd18e81.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_7ac584ba4e6e4ba2adcb5bd440739f4a.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_42b25d3b039f406aa0ff47fabeb8d4f2.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_d46aa9e4d1864bd2876e7198faf66827.pdf?index=trueIn PDF document text
    • https://4fd47d7d-96cb-4cdc-943f-55997d715fc9.filesusr.com/ugd/ab3424_f58ed0cde1714cdca3c06ee924179d08.pdf?index=trueIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_0c3d64a88bca4a529ba3249494f1a3d9.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_035574cbfc024ae5a6b5732445c02e17.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90395c90-1eef-4fcf-99fc-aa558d4e90da/kuzuxigezusafivomamo.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_154e1d2fe5eb44c7b0acfa30135f8e3b.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_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 5348 bytes
SHA-256: c0993f8eb4476ef4713ee705cf42ab4edfc995166984a4c17d652841a8dabc62
font_01_sfnt_off00013198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13198 11080 bytes
SHA-256: 6ab72370a1d9ccb1f1a02b30c606e882412dd8a1b03d686f228ae8c106380934