Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2f4828ae8d4ad0…

MALICIOUS

PDF

80.1 KB Created: 2020-11-29 23:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0905fa31517e630c441f6c496b3fde4e SHA-1: 8f282856cba1dcb1646b558f185c4a50ee4d7cc5 SHA-256: 5a2f4828ae8d4ad0314f597c7a11331c799da72312fe43c90c5dd3d8889e316a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://trafffi.ru/strik?utm_term=symbol+for+friendship+in+chinese PDF link annotation
    • https://najatiwexit.weebly.com/uploads/1/3/4/0/134041182/b8417af.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/161320.pdfIn PDF document text
    • https://xapawijumoj.weebly.com/uploads/1/3/1/3/131379373/3125402.pdfIn PDF document text
    • https://nilanifek.weebly.com/uploads/1/3/4/4/134466172/rejunog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5f8e082789500.pdfIn PDF document text
    • https://gofadoden.weebly.com/uploads/1/3/4/6/134615513/tisolu_dunulupalosew_vojudisajax_gatowaguwazub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_5fa059ee56d44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd41f786-a578-4167-af25-4ce7baadba2b/90977332178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20794569-1535-496c-85f7-ffc54e334c26/tevupug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247d039c-e3cb-44be-b90f-3f47bc15c1e0/a_castrato_is_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafc4f91-caf2-4c08-8015-f6c9fcec96fe/877-235-1091-449_is_true.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/11500840572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca7d533-9a57-45e4-a39d-08ee8e569057/59627928601.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_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 9172 bytes
SHA-256: c92b00bd679e321aa3f9881182cefc26c47478cb7f84c191853d55ed15ef1b03
font_01_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 5528 bytes
SHA-256: b21a5e2dbd41788be7a982ae3fbb31d3e6b0b7dff94a4c3118947e8f886d8190
font_02_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 11616 bytes
SHA-256: f4891da62e2e0687e130d878530740ccff93b5899395aca8a639a20d51fedbce

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