Malicious PDF — malware analysis report

Static analysis result for SHA-256 9148ebf570d2fd0a…

MALICIOUS

PDF

75.0 KB Created: 2020-11-25 08:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 131bd9891f4308975511a890867e201e SHA-1: e076568fc9a09bad72161b196e182f506d7ad96a SHA-256: 9148ebf570d2fd0a08a9881d77b71d7f9521fcada093d4d51d769442effb05d8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary malicious URL being 'https://trafficel.ru/strik?utm_term=roger+from+american+dad+personas'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafficel.ru/strik?utm_term=roger+from+american+dad+personas PDF link annotation
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/pisaxipolig-zelares-vukaw-wimewiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_5f9d5d4d1fba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_5fad383286f58.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/d8457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_5fa890859822f.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/6b15e18a-cc46-4b9f-9001-0978642c5b30/ladaginax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4fbc82-af43-40f8-8d4b-a6d8d6334c10/funixusifozoxutozunis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9734601e-0405-4488-a052-b16648729a59/most_recent_job_title.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a03c43a-8764-46b8-8a5b-8cd5fb48d69b/53331502545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a21fb3-6911-4ba9-b882-fa52160047d1/ase_a8_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed55588-9b34-4df1-b80b-6ca72f4b776d/childrens_express_care_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cea0f5a-14d7-4852-bdf6-c667f36007f5/mod_menu_gta_5_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6443b1c2-7d4c-4e4a-ad49-54c8f59e77f9/16537564263.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_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 5448 bytes
SHA-256: e5bf7b6b501270171e27c4d2dc976fde9a18032673588363cc3cddf6849955bd
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 11544 bytes
SHA-256: 905e04707a76c966402418fc099dc3457d8c7c7b2f2a0134fc7ab9b9094649c2

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