Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a33b5b96cad00e…

MALICIOUS

PDF

85.0 KB Created: 2020-11-25 00:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f2206bdfaaec72aa50072cdbc45a0702 SHA-1: 648db09f612b43607a4c2c3bbee69d5ecfb10fa9 SHA-256: a4a33b5b96cad00ecc8295c4075f5a8b5267d787c79ac094af39133c34f8bc80
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://traffine.ru/123?utm_term=fastest+way+to+level+bfa+8.2.5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f9e957506cae.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/jajomofak-likokawexux-xejutatupiz-vitunuzovuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5fb82a0d6e9e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f870d053f6eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_5fbd82a973e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_5fbd8713ab1a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f90138931405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_5fb5bba6cb0ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_5fa76b71ed30c.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/8051a4e06c.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/a64ad9e9-65aa-4044-a88a-313f2bf7c4c3/2484357186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1920aed-99ce-46c1-877b-9e4b540410ae/64321736446.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/vamaralujalipobafoje.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/7695276749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956d58d7-d437-4527-b862-b16663c0f59c/worksheets_of_letter_g.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87F 5496 bytes
SHA-256: 1698f7ca0aa4fae9ffdb65a7e002b9d944fc25375ed9340fb105f2f9caf53e67
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 11088 bytes
SHA-256: 94d4fa8e24234c15a762279b1bdc4e52dc310314f5cfbebff61c3b8c6b51b092
font_02_sfnt_off00013172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13172 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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