Malicious PDF — malware analysis report

Static analysis result for SHA-256 af369b116c89a7c5…

MALICIOUS

PDF

77.1 KB Created: 2021-05-30 21:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 935fcd86edae5f585c94f0242b4d9a00 SHA-1: 715e08ea40d86463db03ed8ac2e72f3247cd4a88 SHA-256: af369b116c89a7c58975b2a40f00b2eacec8e53950fbf1373d61aa6fabe63e7d
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 0.9998

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
  • 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://druttle.ru/123?utm_term=oklahoma+agricultural+tax+exemption+form PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489724/normal_5fcd0f1a18459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fdaef353ccd7.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/6e56eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_60372b1fa0d71.pdfIn PDF document text
    • https://nexevakef.weebly.com/uploads/1/3/5/3/135327015/1c5692f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_606ad359183e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_604a512435a00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444649/normal_6007519bd4e2c.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/6051ab43-7407-4963-a5c1-f897c0e0b625/nikagajagepiduga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ad7694-1950-479b-96da-f6cb505a1bfc/21710746407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7c986a-5271-48dd-92b5-6fa9f9489149/sword_art_online_progressive_7_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fe97f2-3943-4a4d-b792-d6e6ecf6da70/49596575149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4c1c1c-e1ce-4d43-8526-1361075587eb/vifidezigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec76225e-9695-4ace-9885-0fadc3fa526c/panasonic_viera_plasma_tv_th-42pa60a_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56edd4d0-4678-4bc4-9fb4-f8848448cf50/fantasy_theme_criticism_artifacts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/951f2dfe-e2de-4e06-8988-4b8c6e9d6c81/11832554616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4633c9b7-1c4c-4611-8a6a-bb10853879e2/75915402170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d6c237b-c37a-4b6d-90fd-0f5eb74ed692/how_to_draw_a_cartoon_self_portrait_step_by_step.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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5408 bytes
SHA-256: 0c19b858c2c8b87d5fb3b1ad121f622e089d1cb267dc67c64612a8a8fa7b94ce
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 11156 bytes
SHA-256: dc84768d93daac38e5c6d0479bac674edba3a57bf9925bdaee992704cb7a8110

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