Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b652c7ed6af513b…

MALICIOUS

PDF

68.1 KB Created: 2020-11-11 11:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dc5042cf9ff77567a9dd6a7917e39674 SHA-1: 99a001a1b657da48cbcc60b5cfa1ae1501121250 SHA-256: 4b652c7ed6af513b96192ec72de5fd9fabb6049fba68fa63e3fca14644715c15
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'traffking.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. The presence of numerous external PDF links, including one to 's3.amazonaws.com', further supports the idea of a coordinated malicious campaign.

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://traffking.ru/strik?keyword=cyclamatic+power+plus+electric+bike PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5fa5b3bb7dfa8.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/vetepubep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5fa1fa91ba15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f8fbe901d57e.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/f6ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_5fa789dada880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_5f9a60be60f7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_5f96ba7157b23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443578/normal_5f9c39ed93155.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/henghuili-files/tisiwalonib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2483e1f-1f3a-4992-b63f-a3f96d990a44/majif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006d368c-aec2-4f51-8567-577b34543de9/endless_legend_factions_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1b12b7-51f0-4005-9387-abef8dacf53e/8291799801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555a5c75-6abf-46da-9b58-d8721db0bb81/tajorujelisipiladopigot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a68a550-8a36-4c5d-82fe-f32c3a18d130/frankenstein_chapter_21_quotes.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_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 5384 bytes
SHA-256: 0aba6a03e4712c92b883a08a3faa8195cc2bfada8e6e0b1068fff1b8d528bfc5
font_01_sfnt_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 10428 bytes
SHA-256: 911693be54ece6e56df5590d6dd4b4624d02a0234c515049720b9db5bcb32534

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