Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0a211a02ec18a3…

MALICIOUS

PDF

33.3 KB Created: 2020-11-05 22:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 16d93093a4335012f91b9d0f5fee0530 SHA-1: 762f4701bdbbedb7c45baf20357c416308404752 SHA-256: 8f0a211a02ec18a30d9e9bb8c6e66db6ad9949672be98945582061ed264ea8c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains like weebly.com, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests it's designed to redirect users to potentially harmful content or further stages of an attack. The document body itself contains garbled text but includes some of the URLs, reinforcing their role in the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffnew.ru/123?keyword=firth+school+district+%252359 PDF link annotation
    • https://terowibew.weebly.com/uploads/1/3/4/3/134370771/tazep.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/tanesopugadozuz.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/a1488b7acea2d.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/minajadusokovanadara.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/fararaguze.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/7006100.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/pumegesanafojuravag.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/dabatisew/kezizawarojefinedas.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/word_document_to_converter_free_download_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead6bc7f-7942-4e36-b959-9aa4a231ca48/ninuv.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/noputizujaxewejujefepej.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_off0000461f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x461F 4772 bytes
SHA-256: 03dcb6f8ed430017e23633d9289dd910cee91b6e26a56903a211f5066bbfdb39
font_01_sfnt_off00005652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5652 10228 bytes
SHA-256: f75861a56915ac65fd16e7de4d061ad649e70b02fadf893bfb96e93eb6469822