Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bc9259dbe684c1…

MALICIOUS

PDF

37.7 KB Created: 2020-03-26 11:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 873eff898942693f66e82332dc2b33be SHA-1: df5dce7ca63a034eae4fe0cd6169d2b727f7c020 SHA-256: 75bc9259dbe684c1fdbb86128e9b03a6c5c7925dedde412dae15466fc5cc21f1
96 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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://shardexplorers.com/uploads/1/3/0/6/130620959/130620959.html#histograma+y+poligono+de+frecuencias
    • http://healthyredesign.com/uploads/1/3/0/4/130489423/xajejuwozoz.pdf
    • http://mybarrels.net/uploads/1/3/0/6/130620964/1f326.pdf
    • http://orlandoorchards.com/uploads/1/3/0/3/130379248/juzutekesomosonosep.pdf
    • http://misfitsagony.com/uploads/1/3/0/7/130775726/teraxirajexa_guluzezamul.pdf
    • http://www.aedanpettyphotography.com/uploads/1/3/0/4/130488412/3314450.pdf
    • http://krgabogados.com/uploads/1/3/0/4/130483552/zeguz-xiretetob-lusikaxilug-sakesupepijup.pdf
    • http://26thplaceflats.com/uploads/1/3/0/4/130488398/87dcdef746.pdf
    • http://naturesworks.net/uploads/1/3/0/2/130272609/satusutonodab_rotukugujeza_buliguginenux_pasevi.pdf
    • http://handsforautism.org/uploads/1/3/0/5/130538953/rezuzadijemakemoza.pdf
    • http://jlmjustlikemommyaccessories.com/uploads/1/3/0/4/130488227/f6c30d9aca2447.pdf
    • http://site77633.mywhc.ca/uploads/1/3/0/5/130545882/rerevamebipibob_xogijuku.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006800.bin
221d761baae56b213446269f892693c2242b0249831048fd801ef611db23c133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6800 8820 bytes

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