Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a58c368083c6e80…

MALICIOUS

PDF

68.0 KB Created: 2020-12-22 16:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eb4aaa8b801a9caecb110176cb26e8c SHA-1: 76872515501f830ab9cb617695ebbe71c167fdbe SHA-256: 5a58c368083c6e801624750b03d8d0b3622f21e27ad617f5514152d3f6056d26
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=division+using+area+model+worksheet
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/180357.pdf
    • https://jazezuko.weebly.com/uploads/1/3/4/3/134389352/vokilol-nelatadijefu-zages-kazub.pdf
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/473436.pdf
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/vetigoza.pdf
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/zaxofifanogaf.pdf
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/0e4de.pdf
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/pomizapitugelesotamu.pdf
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/misuw_mokej.pdf
    • https://cdn-cms.f-static.net/uploads/4457582/normal_5fc2b35a5c722.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fdc9c5750e6d73f00913032/t/5fdd193dcdd31e61c0aa9e60/1608325440047/heart_failure_preserved_ejection_fraction_guidelines.pdf
    • https://static1.squarespace.com/static/5fc114532bbd74065807882e/t/5fc1e9d218e72e5fdb1d0a2a/1606543831582/86487411907.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf0cb73299f0c5438bb58/1606217932992/gidizozinaligopur.pdf
    • https://static1.squarespace.com/static/5fc1df7188c99b6d37ae0383/t/5fcb5ad66fd93023bc03a9ca/1607162583504/94991763106.pdf
    • https://static1.squarespace.com/static/5fe11e1c59bb36377152c879/t/5fe1651a412b5b6b3845dc8f/1608607003157/alveolite_allergique_extrinseque.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca89.bin
2f9e426b77054f2b4bbb610f2d3089008d44c100dcdbf68a3a53dbca901510c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 5452 bytes
font_01_sfnt_off0000dd06.bin
6fd1b219371b36d818c8d42b3bddb919717aa8cf95be827f2b082fee80dd6624		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 11156 bytes

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