Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaf52e3ca5dd9a6…

MALICIOUS

PDF

38.6 KB Created: 2020-04-04 15:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19af4673930affde82ed83d40488ea15 SHA-1: c3023a6775d4251f0378814a4cb90c8ab96de566 SHA-256: 6eaf52e3ca5dd9a6eef2ec6783e2f95336e2852261af2295c1970e21a5152acb
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially harmful content or further stages of an attack. The document body contains garbled text and a few URLs, reinforcing the link-based redirection strategy.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tengo-hoshi.com/uploads/1/3/1/4/131438639/131438639.html#paneles+solares+chile+venta
    • http://suffolk-digital-marketing.com/uploads/1/3/0/5/130588940/gixivovutimapodel.pdf
    • http://winningteamclub.com/uploads/1/3/0/6/130639360/juzavifa.pdf
    • http://hollysnailcare.com/uploads/1/3/0/5/130541765/fde8e2f.pdf
    • http://agropol.lv/uploads/1/3/0/2/130272332/493441cef2eabde.pdf
    • http://taylorstimelesstees.com/uploads/1/3/0/6/130621908/xujurened.pdf
    • http://algarve4elements.com/uploads/1/3/0/3/130313619/ratotapovaw.pdf
    • http://gordoncraigcpa.com/uploads/1/3/0/6/130639220/zuzaxaziduvefem_piris_kuwulowexube_gidifun.pdf
    • http://sauruascentre.com/uploads/1/3/0/6/130621217/vamajoxukel_tetonizo_rozabum_wexusonilefurip.pdf
    • http://firstwavect.com/uploads/1/3/0/3/130323249/7169898.pdf
    • http://cygnolia.com/uploads/1/3/0/2/130288757/zumizu.pdf
    • http://mrskingteaches.com/uploads/1/3/1/0/131070187/4595056.pdf
    • http://calipulmonaryrehabservices.com/uploads/1/3/0/5/130551468/4941007.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_off0000679b.bin
50b392c68dbb02022a5b97ff84400dae535ad9b6c6859b9cce15bd39c484dc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679B 10304 bytes

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