Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed1468a3ad8bdcc…

MALICIOUS

PDF

69.1 KB Created: 2021-01-14 05:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d7fcaa22a4e828caa4bc9f52716a0d90 SHA-1: df05a124710b88a65215073e808b435ede3e998a SHA-256: fed1468a3ad8bdcc702031f32bde7dd799370a0e33b6f5dc021a552580ce7c68
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a potential for distributing further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=helios+flight+522+reddit PDF link annotation
    • https://site-1177548.mozfiles.com/files/1177548/pagodobaga.pdfIn PDF document text
    • https://vakonawokedoze.weebly.com/uploads/1/3/4/5/134522954/9335323.pdfIn PDF document text
    • https://visegonikagade.weebly.com/uploads/1/3/4/6/134626066/72222304275606.pdfIn PDF document text
    • https://site-1173450.mozfiles.com/files/1173450/47095012050.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/346801dbaaa.pdfIn PDF document text
    • https://sirofutalaga.weebly.com/uploads/1/3/4/7/134706343/c54ac5e81.pdfIn PDF document text
    • https://reledizov.weebly.com/uploads/1/3/0/7/130775001/7761530.pdfIn PDF document text
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/5667223.pdfIn PDF document text
    • https://site-1175524.mozfiles.com/files/1175524/bitavakitivela.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/fosalizuzu/billetes_colombianos_para_imprimir.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_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 5176 bytes
SHA-256: 28f243470d8ba4e2daebc22f16bc1e02143bb274482c3eb09d370921bb95990c
font_01_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 11524 bytes
SHA-256: 3416ba1fb410c1426807065bad5e47f09a261bc1471fbc75dc7b5b116245320b

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