Malicious PDF — malware analysis report

Static analysis result for SHA-256 19835dec52c037db…

MALICIOUS

PDF

75.9 KB Created: 2021-04-01 06:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 009d09dcf03cd98c3ca0fef59b30a82e SHA-1: 015f40ccccc096bf647b878292589537b75f83d0 SHA-256: 19835dec52c037db6699793bfa23bae7bda56ba87ac7a8347506690fe1895339
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/123?utm_term=dictionary+google+app In PDF document text
    • https://cdn.sqhk.co/nilofixogezu/dAYhaCZ/vaxuw.pdfIn PDF document text
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/xasaxabosed.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/dtHstjt/97448980959.pdfIn PDF document text
    • http://legko.travel/what_are_3_facts_about_the_declaration_of_independenceub1sh.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/g2ighjJ/geometry_dash_subzero_pc_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/mcjhqfV/49555657961.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/eijjfhg/gin_rummy_plus_unlimited_coins_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ketodumukiv/ih9gejd/terafiw.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/h5gezie/wokizu.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/gcliiii/rutimatokijeteganex.pdfIn PDF document text
    • https://nipituwosaxow.weebly.com/uploads/1/3/5/3/135312928/29f2dae49a7282e.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/igidhjL/79177505830.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/2066261.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/ibjdSSE/bafexirisejixedixobenuno.pdfIn PDF document text
    • https://cdn.sqhk.co/puburasar/uibiwhe/baixar_app_cabify_motorista.pdfIn PDF document text
    • http://dragonflysagewellness.com/sampling_bias_in_research47axe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_d3949d2e0d6b48b6aa16e4667f5a36e9.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_39a219acecbb4e5d9eb80ad7d8a163ee.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_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 5024 bytes
SHA-256: 5b47d8549af3239c919e70907070159abc08aa7ee5753668d187993c93540918
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 10736 bytes
SHA-256: d16087298e4624ff0991ad7fb497b09689fdb7e92942b977f3d7e91742b5d470

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