Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b369d547e33c95…

MALICIOUS

PDF

34.4 KB Created: 2020-05-16 05:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e5db988b81113152dc36c3f373099f1 SHA-1: fd168a5904a4abd2e0293fb8c9e2875136ea2196 SHA-256: 82b369d547e33c9543eb15e88c36c7150c194dbd1d15592cc0e6da8206887892
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF link farm. The ML classifier strongly indicated maliciousness, and the document body contains obfuscated text and URLs. This suggests the file is designed to redirect users to potentially malicious websites, possibly for SEO manipulation or to serve further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://youbrewchicago.com/uploads/1/3/0/7/130739871/130739871.html#amazing+images+hd
    • http://zellengadi.com/uploads/1/3/0/4/130483390/jizagixavu.pdf
    • http://oksk8co.com/uploads/1/3/1/4/131407592/4200215.pdf
    • http://slayerwasp.com/uploads/1/3/0/2/130272080/pobesonasasan.pdf
    • http://aceofdeuces.com/uploads/1/3/1/0/131070190/d69e05f.pdf
    • http://brazybraidz.com/uploads/1/3/0/6/130603728/83bbd2659.pdf
    • http://escapadascba.com/uploads/1/3/0/4/130436354/pujiguzuzoje_warizi_taligaz_zararosukowat.pdf
    • http://southbaymaintenanceservices.org/uploads/1/3/0/8/130813531/2753341.pdf
    • http://kurciski.com/uploads/1/3/1/6/131637886/koditazodupox.pdf
    • http://amirahhutchence.com/uploads/1/3/0/6/130605194/zebasawabut.pdf
    • http://bestdoghotel.nl/uploads/1/3/1/4/131407558/4e09fec05.pdf
    • http://xiexie.solutions/uploads/1/3/1/3/131378835/5617706.pdf
    • http://redwallstudio.net/uploads/1/3/1/3/131384289/badepoxafo.pdf
    • http://refencesystem.com/uploads/1/3/1/4/131410736/2448913.pdf
    • http://atrakcje-plenerowe.pl/uploads/1/3/1/4/131438888/8955506.pdf
    • http://bistroallo.be/uploads/1/3/0/5/130550830/3405555.pdf
    • http://vitalityinvestmentsinc.com/uploads/1/3/0/3/130379098/rasafatunudinogugom.pdf
    • http://rosisgarden.com/uploads/1/3/0/6/130621698/0585396156.pdf
    • http://classiclakedistrict.com/uploads/1/3/0/7/130776149/dd8108b5ce6faf.pdf
    • http://jrassociates.org/uploads/1/3/0/4/130476525/fokofepule.pdf
    • http://escondidoresorthonduras.com/uploads/1/3/0/6/130604595/ba3efaec5d06.pdf
    • http://brokenbranchworkshop.com/uploads/1/3/0/6/130621702/kelor_gofep_rijuxinev_vufinif.pdf
    • http://wetnosetherapy.org/uploads/1/3/1/3/131379198/4ff028d7d3ad.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_off00005cbf.bin
699874352547ac1b10135a29903dffe257de9f02b4f2db473181436651becacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBF 9692 bytes

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