Malicious PDF — malware analysis report

Static analysis result for SHA-256 4303847dae5baea1…

MALICIOUS

PDF

69.4 KB Created: 2021-03-17 00:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d3dada62991a2cee298ef4446f26fc9a SHA-1: 9186f19f704eea486f516b0139c26fa1842fdf13 SHA-256: 4303847dae5baea16fdb01aa9376ed4f37a025daf9ef8ef773d3897d15ce9c04
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be disposable or used for SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://resalured.ru/wix?keyword=section+6.2+process+of+meiosis+reinforcement+answers PDF link annotation
    • https://cdn.sqhk.co/xogudililavo/lAbheha/bunny_running_in_circles_around_me.pdfIn PDF document text
    • http://pe50off.info/rebazularinijzbzeu.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/lixulipafuwowaruj6x4w3.pdfIn PDF document text
    • https://wimopoxidiki.weebly.com/uploads/1/3/5/3/135313965/weruzajojojul.pdfIn PDF document text
    • http://good-production17.site/eraserheads_song_list_freekpc14.pdfIn PDF document text
    • http://topstop.site/xumazerizavitolt8kp.pdfIn PDF document text
    • http://futup.ru/antarctic_ice_sheet_massx1n45.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/jheigGA/pikedida.pdfIn PDF document text
    • http://strahuemsya.info/327108325115ca0g.pdfIn PDF document text
    • http://nosinoski.shop/ejercicios_matematicas_6_primaria_santillanaa4xfa.pdfIn PDF document text
    • https://gijepunudadolow.weebly.com/uploads/1/3/4/4/134497403/xozogipapelusabose.pdfIn PDF document text
    • http://cetapp.xyz/94148938600z2dxh.pdfIn PDF document text
    • http://igafnd.org/permutation_and_combination_iit_jee_notesxp9fm.pdfIn PDF document text
    • http://itactical.xyz/61922452814dqj8n.pdfIn PDF document text
    • http://avto-trokot.xyz/49709193367wcx8k.pdfIn PDF document text
    • http://zumbayuliya.online/gramatica_en_ingles_avanzado_9kxh3h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_4f126b8452da489e9dc46f3c98b10cf4.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_d384fcc80db444da89afbe4a3620dd83.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_f6e6e3cd03c94cb7a10b79705309a865.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_eb120ce22c7d4d229a13ce91c8acd690.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_a2f96c1fd89f467f8ab33f78740a667d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 5640 bytes
SHA-256: 94788e760bb79a7e4de93de14c5d3ef285b3e9348b79faa00cc59d16bf83afe4
font_01_sfnt_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 11396 bytes
SHA-256: 42fbb3a6be497f01688941dc67f97f73a0120bee5a3f609d081ee7f189d5bffa

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