Malicious PDF — malware analysis report

Static analysis result for SHA-256 769af6b4fc9b2544…

MALICIOUS

PDF

80.0 KB Created: 2021-02-23 20:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6bfc2cc8fb97d9aad69aadc5b7763127 SHA-1: 669e0e41999769df779f5955a1041bcfccc226c2 SHA-256: 769af6b4fc9b2544f60538033570828c66faf17c90acc3d91ea4cf2b93fd7479
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure aspect.

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://baarspo.ru/wb?keyword=non%20destructive%20testing%20companies%20near%20me PDF link annotation
    • http://kiwaliguza.iblogger.org/autocad_2019_classic_workspace.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/cfedb63e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5fd9495add7f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462036/normal_5fcb76ea2264b.pdfIn PDF document text
    • http://metinozub.iblogger.org/illumina_miseq_sample_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422628/normal_5fc8e5953c345.pdfIn PDF document text
    • http://narelavupes.22web.org/vba_cell_value_format_date.pdfIn PDF document text
    • http://vikunokanafigul.66ghz.com/piano_concerto_no._1_tchaikovsky_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fcce58133e5c.pdfIn PDF document text
    • http://firejifanop.iblogger.org/badland_brawl_apk_latest_version.pdfIn PDF document text
    • https://latowinu.weebly.com/uploads/1/3/4/5/134508675/6117885.pdfIn PDF document text
    • http://sobanurosu.22web.org/office_interior_design_software_online_free.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/2679106.pdfIn PDF document text
    • https://zugixipenelir.weebly.com/uploads/1/3/4/5/134591811/7612428.pdfIn PDF document text
    • http://jujukakajita.iblogger.org/kenwood_tm-d710ga_service_manual.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/5815388.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisolapuri.rf.gd/lockpickinglawyer_website_covert.pdfIn PDF document text
    • http://pasobopupolom.rf.gd/65271947236.pdfIn PDF document text
    • http://raxajuneneg.epizy.com/zawifemiledid.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_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 5388 bytes
SHA-256: 8b850cf2da744c25e6b22fb103e4fa40bbb9f1b0428b55761b4c599520cde7ac
font_01_sfnt_off00010d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D87 10872 bytes
SHA-256: 07140447700660e4838ee6c0ec6ebcd329cbe2ae3592cc18e922ef5026204424

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