Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdd494a6b90ac5e…

MALICIOUS

PDF

113.9 KB Created: 2020-12-24 13:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5cbee228a857ad7db6bb7fdcc45d40a0 SHA-1: 55e78ce52be17ac80476ac9f398ef855ff29f97e SHA-256: bbdd494a6b90ac5e843544ddeb3a0301e34d11bab3fef865c356506573657c4d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or redirection mechanism designed to obscure the ultimate destination. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may leverage embedded JavaScript for malicious actions, such as redirecting users to phishing or scam sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/aws?utm_term=brookfield+asset+management+balance+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8aa7945df40.pdfIn PDF document text
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/aade4b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5fb542e53cb62.pdfIn PDF document text
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/5799171.pdfIn PDF document text
    • https://dudulisatosix.weebly.com/uploads/1/3/1/6/131637211/1964897.pdfIn PDF document text
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/2d6b8b3125aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fd36a26e2bc0.pdfIn PDF document text
    • https://tesiriwukabu.weebly.com/uploads/1/3/4/5/134586845/fogiwasagejobonibo.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/wazotojemov/plate_tectonics_vocabulary_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/lord_of_the_rings_elven_symbols.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_off0001805d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1805D 5688 bytes
SHA-256: ceca946d25438ac2a333791feeb0d9ea3a8d5fb086b71e325ec5412a759465f5
font_01_sfnt_off0001938f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1938F 11524 bytes
SHA-256: b57d4d10898dd236b64c8c24b1c69605dad42a4835beeeb20df0cc1f225b8933

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