Malicious PDF — malware analysis report

Static analysis result for SHA-256 b454130a12ff3cbe…

MALICIOUS

PDF

41.3 KB Created: 2020-03-21 10:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 121fe45d51005ed6fd747914e84cfa95 SHA-1: 0ecb8997aa81b498b4db1fa432758ddabdd61c15 SHA-256: b454130a12ff3cbe77de6aa27f3ed202c2e1fc9f989c62d567bd48ebdec27d30
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to other PDFs with numeric slugs, indicating a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to a network of these generated PDF files, likely to serve malicious content or ads.

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://jewels-hair-studio.com/uploads/1/3/0/6/130639385/130639385.html#que+es+confiabilidad+y+validez+en+una+investigacion+cientifica
    • http://phytocapital.com/uploads/1/3/0/6/130639779/fafet-newigipul.pdf
    • http://signatureinspections.org/uploads/1/3/0/4/130483939/rejetubemekasa-rorenaza-sidifafemitim.pdf
    • http://admin.barrittlaw.com/uploads/1/3/0/7/130775841/taxomaso_pitobude_dupefuru_koperiradu.pdf
    • http://euroartberlin.com/uploads/1/3/0/5/130588606/lufebamilexetajadij.pdf
    • http://www.cinctureco.com/uploads/1/3/0/5/130538816/votor_nadugimo.pdf
    • http://www.liftmedialab.com/uploads/1/3/0/8/130813866/499e874378a3.pdf
    • http://projetoedificar.com/uploads/1/3/0/4/130488399/7fe50fe629e30b.pdf
    • http://schraderlivestock.com/uploads/1/3/1/1/131164027/ed102e5da.pdf
    • http://wisconsinlimousin.org/uploads/1/3/0/5/130551449/d0f292a533c9a5a.pdf
    • http://www.downtownldnliving.ca/uploads/1/3/0/5/130551231/105c9b743774.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_off00007559.bin
0d875ea798dc41cd408b939e1ce486f08d4e26fb23cf6e5e1966837d30680ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7559 9024 bytes

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