Malicious PDF — malware analysis report

Static analysis result for SHA-256 e919f22c82eac6b0…

MALICIOUS

PDF

72.8 KB Created: 2021-01-01 04:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b261d2bd7e921480d25032617a3c7412 SHA-1: 1f3dd869311897ab727b1a233b024baa4d5c37c1 SHA-256: e919f22c82eac6b0e6c12927b7eec2be176bd5432cee4bed2698d8468d9c1aa4
156 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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffnew.ru/123?utm_term=html+and+css+for+dummies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489028/normal_5fbb640ba1aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5faff4399d66e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5fa99afb19856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5fb9432a6e29e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fd2c584f0232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_5fbf0fd4a2c1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fee7d9d91782.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/1866834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_5fbd48abb5d9f.pdfIn PDF document text
    • https://nuzokubipodopu.weebly.com/uploads/1/3/4/7/134732356/fesogowedogag.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/db610788-6836-47a1-97d2-5a55516f84f1/vuvuzava.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/driver_wifi_adapter_tp_link_tl-_wn727n.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da866e29-fac4-4a5d-b5a1-7a767f0a5dfb/lojevap.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_off0000daa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 5128 bytes
SHA-256: eb4693c128ab463411172a5057b62b06ca4524205ab46ac5db011acc82588c8d
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 14080 bytes
SHA-256: d587ee8f52279cd8685799aad61003a9f353827e357f1f35bcd2c8d4e5b05b71

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