Malicious PDF — malware analysis report

Static analysis result for SHA-256 623d8b617a21c4ee…

MALICIOUS

PDF

29.6 KB Created: 2020-05-30 10:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff0f6d3b9ffa67f8f89a2afe6a81d6ff SHA-1: 677688354f4d5463ca6b7fd7febe558cc31f3f08 SHA-256: 623d8b617a21c4ee471b4ef408dbf097417e0dfdc578bc660f34f6a3e7b6c47d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a PDF link farm. The primary purpose appears to be directing users to numerous PDF files hosted on various domains, potentially for SEO manipulation or to distribute malicious payloads. While no scripts were directly extracted, the heuristic firings suggest a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://falaliyulechengbaijialehaowan.br3h.com/uploads/1/3/0/7/130776788/130776788.html#medical+sociology+14th+edition
    • http://birthingearthlings.net/uploads/1/3/1/8/131856414/604574e8522.pdf
    • http://bluegoosepropertyservices.com/uploads/1/3/0/6/130639803/juwexewam-katibowadunon.pdf
    • http://pinevilledui.com/uploads/1/3/0/2/130291809/susomigurolato-zuwomapawuvem.pdf
    • http://back2balancenursing.com/uploads/1/3/1/4/131437490/5966404.pdf
    • http://mta-sts.mx.victrixcmc.com/uploads/1/3/0/9/130969543/1799536.pdf
    • http://clear-home-solutions.com/uploads/1/3/0/7/130775819/letegelijilalu-banaxomoti.pdf
    • http://soulsurvivorbook.net/uploads/1/3/0/5/130550825/zuguwo_geweku_vazoga.pdf
    • http://sapir-forum.org/uploads/1/3/0/5/130541103/vazexadotatekipun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b72.bin
2b1e1ee0b26cafb3767d7de692115d2907d59e2b260ee5ee4a64d1b98350297d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B72 9404 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.