Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e81d8f0edd7784…

MALICIOUS

PDF

65.1 KB Created: 2020-11-20 17:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3bb6ebf181bbb22a22ea0e5246b0861d SHA-1: a11f8b56c4c860ee398ab493b25a3e1279cddb69 SHA-256: 58e81d8f0edd7784fb93706c5d53f1e99e0eb7889847bef4faa915e6915756db
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites for phishing or further payload 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/123?utm_term=tech+guns+mod+reaction+chamber In PDF document text
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/gorude-kimefibu-sifipa-rejifela.pdfIn PDF document text
    • https://tozijaletaxe.weebly.com/uploads/1/3/4/3/134312516/wefap.pdfIn PDF document text
    • https://gamorajemusuro.weebly.com/uploads/1/3/4/3/134316050/33ff9d62.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/e43f5f3c-64e7-4427-9ca8-5291a7c50742/element_compound_mixture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e7bfa0-b3e3-42b5-b02c-7f52ebcf977f/959839230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26c728b-b3f3-4236-9197-2d2cedcca866/70593552597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4377137b-f1c6-4681-927b-739dba8685c2/xigoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/telecharger_attestation_pole_emploi_cesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7cd9fb-8599-49f5-87bd-1839fceb5e77/22406132850.pdfIn PDF document text
    • https://s3.amazonaws.com/suzitivasekoga/56200161608.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/mazanidudikolibeguxugiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4959b1e-9ae9-4aef-87ea-ab4fdb7fd9f7/kemarifudig.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/el_libro_de_enoc_ilustrado.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/34517171959.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_off0000c06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 5408 bytes
SHA-256: 23c4225a45bf5fa237750e694c813b84b48495cf785c751a85dac1c8d1e64068
font_01_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 10332 bytes
SHA-256: 82d5c770c417ae7be50357f0f728f4e1f4490bbd6f4ae76cc37a207f4c2926b4

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