Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2be58900c983d7…

MALICIOUS

PDF

60.5 KB Created: 2020-11-25 11:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 02885cd73b7b39a291222a87e342f076 SHA-1: 1f6a3f55d6ef0d8e472c2b5ecdc660822dc33d26 SHA-256: cd2be58900c983d70445d85bfe4bbc8ca99a074f1f0c8498e10e65b7da19361d
254 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. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffmen.ru/123?utm_term=50+sombras+mas+oscuras+pdf+descargar In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f932d3d4d8f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f8758590257b.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/84055fb5a3fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5fb951f76b6e6.pdfIn PDF document text
    • https://piwututa.weebly.com/uploads/1/3/4/6/134625425/vajunosed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_5f9ceadf2f218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5f8d765e931a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fac017facd2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5fb607fdceb56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5fa045e1ac9d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5fa76467f3514.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/sakaburepagase/business_plan_for_lawn_care_startup.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/oregon_dmv_written_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/femuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/66525213984.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_off0000adcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCF 5752 bytes
SHA-256: 54e09bb1e4a448265a9c4e37099d89fdace2be85e740ba975b94315986569d10
font_01_sfnt_off0000c14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14A 11108 bytes
SHA-256: b872c6cb766e45e04985a7b56f32e94ed3c598ec8554c63e370f22b722a5cbe0

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