Malicious PDF — malware analysis report

Static analysis result for SHA-256 919e1acbc0495120…

MALICIOUS

PDF

82.2 KB Created: 2021-04-01 11:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4e3e6021412241121bc150e7d975e32 SHA-1: 789ab6f25c6770ec80afbf5f907c05eda42591e6 SHA-256: 919e1acbc04951203ec2b758b51d2b42f74b42bcee9a1bf0e7ad358b88433c86
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=cognitive+behavioral+therapy+for+borderline+personality+disorder+pdf
    • https://cdn-cms.f-static.net/uploads/4383160/normal_6056b0684b1d5.pdf
    • http://xteenware.online/moxelilabagotabakeposqc3ck.pdf
    • http://it50disconto.info/what_name_means_daughter_of_godt9njg.pdf
    • http://changepass.online/how_much_does_a_50_hp_outboard_weight5qbrl.pdf
    • https://cdn-cms.f-static.net/uploads/4487897/normal_604a1908c2aaa.pdf
    • http://confirmyourverifiedbadge.com/formation_brancardier_gratuite_bruxellesg1sg9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_73f7942b316b437db14f149898e2a1d5.pdf?index=true
    • https://s3.amazonaws.com/gasodamuza/fugixamumiwu.pdf
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_1f50d44b9fb34030a1144867f1693b3b.pdf?index=true
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_81331ea3a7dc40509189322cfe0c2163.pdf?index=true
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_230b7345b96948c8b229f4625ef2acb6.pdf?index=true
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_8b07725d86dc44b498e6749446248520.pdf?index=true
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_fa102f8651744560b30aa0a3b9a275ef.pdf?index=true
    • https://s3.amazonaws.com/jukoxisojow/world_of_warcraft_classic_engineering_guide.pdf
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_9541e8e80f11484186a18ab854a5d7ea.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001a.bin
612095c411c15115e28709299d7a8379c94532d829f27e7e1a93a2ea6c747d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 5508 bytes
font_01_sfnt_off000112da.bin
18c55ba93feed384d5e4fc66b920ee71bd7082a0a4ca427d29657ba188fa6d84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 11816 bytes

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