Malicious PDF — malware analysis report

Static analysis result for SHA-256 4996e1d14d440f87…

MALICIOUS

PDF

65.2 KB Created: 2021-01-24 09:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 543dce1c387c7c557a38b87b5324dba2 SHA-1: 9f76c20731b7cc678f94472b687326518bb7c175 SHA-256: 4996e1d14d440f87f2289ecdca631bb4de86bbaa04e572286e875200b87b0dc7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the ML classifier strongly suggests maliciousness. The document body, though heavily corrupted, contains text related to 'ultimate assassin unblocked games', suggesting a lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/123?utm_term=ultimate+assassin+unblocked+games PDF link annotation
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/wojedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5fcbfeeb1f48b.pdfIn PDF document text
    • https://site-1168441.mozfiles.com/files/1168441/jodazivulojifina.pdfIn PDF document text
    • https://site-1181110.mozfiles.com/files/1181110/46015257970.pdfIn PDF document text
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/6885325.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/jhdiaib/lekarutumejawufiluf.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/6358164039.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/iyaii1u/11113770189.pdfIn PDF document text
    • http://gofimowekes.66ghz.com/18892350217.pdfIn PDF document text
    • https://site-1174658.mozfiles.com/files/1174658/dojige.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/4842448.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/budixozonafo.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/Hiayji2/29957863202.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/jeZhhfB/27644366980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/website_development_proposal_template_doc.pdfIn PDF document text
    • http://punafifa.rf.gd/red_whatsapp_messenger.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/asparagus_information_in_urdu_language.pdfIn PDF document text
    • http://zozoresupiz.epizy.com/numeros_primos_y_compuestos.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/75475426396.pdfIn PDF document text
    • http://xunonevikonog.rf.gd/template_blog_wordpress_simple.pdfIn 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_off0000c3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AD 5356 bytes
SHA-256: d82126b7baf7f10aea48b6874debfe20cd8e339931cbe6a1951c82a54e7db9a1
font_01_sfnt_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 9928 bytes
SHA-256: 18c130ebf2544769fc928abd843e71dc56dcb7673e70adcc9ddf88e2313c330d

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