Malicious PDF — malware analysis report

Static analysis result for SHA-256 a512ef95e2d301c7…

MALICIOUS

PDF

86.4 KB Created: 2021-01-25 05:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6f99f7171fdaf6c141c767c2b999f7a2 SHA-1: 9b12305c63ea8bda0d725c339f3431ed551eaac0 SHA-256: a512ef95e2d301c74f9802a2e5c897adf17f2986f1cdd62ebaa1fbeb5e11e9de
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=loverboy+lead+singer+mike+reno PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418368/normal_60054a10cc883.pdfIn PDF document text
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/powirari-sagotagibux.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/VjaHIjb/72532941395.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/6788964.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/c7ieibl/davasagim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412778/normal_6006e26b1c92e.pdfIn PDF document text
    • https://cdn.sqhk.co/pukazibat/ygjiias/58788594528.pdfIn PDF document text
    • https://damatabawapu.weebly.com/uploads/1/3/1/3/131379320/dulol.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/safusowetewejudiz.pdfIn PDF document text
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/daxudofol_navej_vavitokofakeve_pesajak.pdfIn PDF document text
    • https://gotanizanoga.weebly.com/uploads/1/3/5/3/135332446/kuvetekuvupax_tamogogubi_vavodi_donajomixogir.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/jjgdi7L/mumewakuzisitaxovuv.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/3125573.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/Fgd3ih9/31031548983.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/khhjhib/guwemote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483083/normal_5fcb1b6ff3d6d.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/YnxyoFU/4_immagini_e_1_parola_5_lettere_soluzioni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/titugome/affidavit_form_zimbabwe.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/mathematician_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/authorised_signatory_list_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/36515446157.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_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 5452 bytes
SHA-256: d0b9046feb724fc9e1af60ca6b417e7867e427ef60d2349d2e2d9d161d7485f5
font_01_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 11168 bytes
SHA-256: a6a7829326e6d453031024054944cfdafb03abcc72bb3571373f31d4363285f6

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