Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53740e6b62470e6…

MALICIOUS

PDF

102.8 KB Created: 2021-04-08 11:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85c00a6c45da15bfddeb760f751e2993 SHA-1: b2b84cd73a50274a57e8d7be7d6306df55801800 SHA-256: f53740e6b62470e6231b5ea0f62e6b47a5937cae8e1b8fa3c0c62d1bfa8184c9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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/strik?utm_term=the+daily+stoic+review PDF link annotation
    • https://cdn.sqhk.co/tixunudixa/iijeGdv/vetifakowi.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/NkEjcR1/35021668500.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/NjjrKja/94178553265.pdfIn PDF document text
    • http://medefoduma.iblogger.org/en_nombre_de_la_rosa_pelicula_completa_online.pdfIn PDF document text
    • https://dirivabekere.weebly.com/uploads/1/3/3/9/133999762/nopulizex-fotes-padag-pexakozitepo.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/s4Xjpie/19172895480.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/2fa0fa.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/vizetuvu.pdfIn PDF document text
    • http://wavigubozivud.22web.org/4217734865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_8702226530ec492eaae4de4ad18702d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4645fdd4-b2bf-4b65-b290-5e0e7f3eb9d9/61208733601.pdfIn PDF document text
    • http://numojas.epizy.com/74881025473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c768d7-cb57-419a-81ef-ea30ba32f78d/fakazawokidudotopol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c41ce41-3216-4615-96a8-7723f8a83943/what_is_the_value_of_f-111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707f7d42-d91d-4f43-a132-f283cadeb8eb/xapevudepemuzitisun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9bef202-f7ce-406a-89aa-e6c3414e4fb7/zamegiriman.pdfIn PDF document text
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_82fe85961aac4f0199641fe0e52b3e65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc2d614-4998-41c7-ad37-077c446a300a/how_to_write_a_narrative_essay_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa00b5b-b21e-4559-8a4c-dd787166c20a/47896864005.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14818 4912 bytes
SHA-256: 8598ca60ee1de9dfc90e3e9f3de70f91e0bfa4878613977defca091116a2a65e
font_01_sfnt_off000158f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158F6 11520 bytes
SHA-256: 3de800c0c091de8057b77b8cf72d58705cdea864f3280b4e12a345eba5172e22
font_02_sfnt_off0001802f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e