Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c72e04ce8a00110…

MALICIOUS

PDF

66.9 KB Created: 2020-12-01 20:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 23a1707b2f564aa4151dfeab4c759615 SHA-1: bc405b586066f86517a7c68578cba05719c65b37 SHA-256: 9c72e04ce8a00110e118296f4b8593304e2cef27f96c837450d9d5f6136f6bd7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that aligns with the malicious link findings, suggesting a phishing or malware distribution attempt.

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
  • 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.
  • 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://cctraff.ru/strik?utm_term=area+code+515+time+zone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f8b40c93b68e.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/mibajonoloxikir-visev.pdfIn PDF document text
    • https://lolisusije.weebly.com/uploads/1/3/4/6/134627287/lijodezoralo.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/serogajugomiji/hbr_guide_to_project_management_ebook__tools.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/101_algebra_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/6120036925.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e15d7d0c8f249d40b1da/t/5fc272cb18e72e5fdb26bb48/1606578901207/the_luck_factor_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/aakasha_ganga_video_song.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c1ca2bbd74065805c248/t/5fc299e4f8cdb769c63835de/1606588901978/31673263082.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/sitowevali.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/relasavejukefejibu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3978f60f2895dc1f8b122/t/5fc60f04fa04221c71ef9e15/1606815493032/lezujoj.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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 5092 bytes
SHA-256: b173dbefc85e65ad1206c687eca5146b4f16f8d2c6cd8c933f91c5bd13b58537
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 10196 bytes
SHA-256: cb6b54d1d84f9763f98642715b2e0ee07dacd568c1c2391a10ec68a053581881

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