Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0d2390e286d9cd…

MALICIOUS

PDF

82.5 KB Created: 2020-12-26 02:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 67bc81ac79209021e509fe841d587a72 SHA-1: 98ba52268036d6a72bcc164cb4877fcbb4e5d86d SHA-256: 4b0d2390e286d9cd1e29db217b5ea0f228255ecdeafa7adce8fd2154c785a922
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute or redirect to multiple malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=meteora+tourist+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_5fd7c1c6cc0db.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/sufexanowugawazobo.pdfIn PDF document text
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/4264289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_5fe66a80bac4a.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/zoromexemuzid/36025941376.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/design_a_logo_free_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/semibudezewok.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/59959603915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44719341-9b69-4e5e-9138-df113da3b0c6/muerte_de_un_viajante_1985.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/exercicios_analise_combinatoria_e_probabilidade.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/wowasurowijafebedobog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b0b830-a5c6-4c0d-b3e5-c880847b4b5e/msi_970a-g46_ethernet_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116edfe3-cd9e-4840-8318-9925b685edc1/20004603835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3086dcc-2945-4dd9-b029-27f9dd82f784/edx_coupon_code_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/81937141902.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/kaxawoperilisutadep.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_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 4964 bytes
SHA-256: b9462f3a7d17716f8116ba95bc10d9471061f63f5b0d7261cf638eb93befdd25
font_01_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 10744 bytes
SHA-256: 7f0cad55815c9993fc523b2c3c65a7442d4d60b96ba37a3cd677083e2f4d35c5

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