Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c8535a0a0f46b7…

MALICIOUS

PDF

72.1 KB Created: 2021-02-25 19:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 961e9e090588eb116490e8438420d6c2 SHA-1: be59e3ab4eafbf488952a27974c6d2841cbfec01 SHA-256: e4c8535a0a0f46b7d65c3346c156d755d2284de10e4a41d1ea0c878b430775ed
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into revealing sensitive information like private keys or recovery phrases. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential harvesting.

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
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://crophysi.ru/aws?utm_term=francis+ching+architecture+form+space+and+order+pdf In PDF document text
    • https://senekidus.weebly.com/uploads/1/3/2/7/132740533/fawefome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479223/normal_5fee6f33e4752.pdfIn PDF document text
    • http://copyright-securityx.com/best_survival_rifle_22lrofwcr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5ff06f0ad4e88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_5ff27230ba654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_5fea27bc114bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394062/normal_5ff62994308b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_601d6d154a481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_602f283b1e4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_601bde0865c3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5ff7b0496446c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6030697b8fe77.pdfIn PDF document text
    • https://lomivemaj.weebly.com/uploads/1/3/0/7/130739076/ruwanomus_tobomur_pizumokuji_zumutuzovu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zadosuwiwebuw.epizy.com/escala_de_balthazar_para_pancreatitis.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_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 5492 bytes
SHA-256: a6834aa43996cd7a289ae5362edbfc560bd1ffccbf53350ebcdeb209a2ef2106
font_01_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 14476 bytes
SHA-256: c8832c251ca74a608f8feefb358e51a803538402fa57ec2b390facf2df30a4f5

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