Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac6d65ef3229dce…

MALICIOUS

PDF

72.9 KB Created: 2021-03-25 04:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8f047ddb30fb9d42e48260e0a53e650 SHA-1: de4662b3089ceb8df04fd62442852c1da3c7905c SHA-256: dac6d65ef3229dcef3b53178462d94f7cafaadc128cf5ea399f1d131c78c6913
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate maliciousness, with the heuristic 'PDF_SEO_LINK_FARM' pointing to a strategy of generating numerous links. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=formation+of+alcohols+chemguide
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/deloko.pdf
    • https://dotofopig.weebly.com/uploads/1/3/4/3/134307416/2bcc0013fc3.pdf
    • https://welaruno.weebly.com/uploads/1/3/5/3/135325412/toduxozova_vegulinekixo_zajaxa.pdf
    • https://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/doridufa.pdf
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/fasavirimitodex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ac1e2711-1cd5-4825-95e3-823323d15995/barn_burning_william_faulkner_analysis.pdf
    • http://wuzegez.epizy.com/pixuxon.pdf
    • https://uploads.strikinglycdn.com/files/015c4d36-c054-4541-b42f-8d2ae0de748e/fojipa.pdf
    • http://fosoxubap.epizy.com/android_studio_setup_master_password.pdf
    • https://uploads.strikinglycdn.com/files/817c4bcf-ee58-4b8d-ab17-0a01af39c51b/82723644150.pdf
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_83f9f3967e19427b886efc88cd17c863.pdf?index=true
    • http://ralifimo.epizy.com/ruins_adventure_last_shelter.pdf
    • http://gujomodezeroj.epizy.com/ielts_speaking_part_1_file.pdf
    • https://uploads.strikinglycdn.com/files/006cf44f-c1f5-48a9-9cda-f4ef2ed8aa93/jupyter_notebook_add_python_3.pdf
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_426a173f88974774b3b9548e72e72359.pdf?index=true
    • http://pakebojubo.rf.gd/nagefimenawogotupiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b3.bin
3b1d4c905d29e433aa87345f3092bd8f9da10434ca8aef45eef3293ee3a961f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 5392 bytes
font_01_sfnt_off0000f2d6.bin
6fd7b8f158428cc3fc74ceece00c6c2e8555b7a2ccac93f877d57cf7f2483500		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 10512 bytes

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