Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2aeaae8a58f0b84…

MALICIOUS

PDF

77.5 KB Created: 2021-06-05 01:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 566ea78608c3c69796df167aa36c3021 SHA-1: a9cbb07bcc617ddacb63bdaf2becd9a3000a498d SHA-256: d2aeaae8a58f0b8415fb6843339cdbc069ac68a1d4b99ca7a3a2e92c706b53a0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One of the embedded URLs, 'https://leonvi.ru/123?utm_term=set+dialog+background+transparent+android', is a primary indicator of this malicious activity. The PDF structure and embedded content, though heavily obfuscated, are consistent with techniques used to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/123?utm_term=set+dialog+background+transparent+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443812/normal_5ff34550ab6ca.pdfIn PDF document text
    • https://favudifobesevum.weebly.com/uploads/1/3/1/0/131070497/kasivuguwaj.pdfIn PDF document text
    • https://mufunada.weebly.com/uploads/1/3/4/6/134623537/9246722.pdfIn PDF document text
    • https://zudobusida.weebly.com/uploads/1/3/5/3/135330479/7105909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5fcf132e5e68f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5ff9004fd4f32.pdfIn PDF document text
    • https://mawatewif.weebly.com/uploads/1/3/0/9/130969671/1012883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_5fd7a7037055a.pdfIn PDF document text
    • https://vumorusumanipav.weebly.com/uploads/1/3/4/2/134234742/jifafakigarawaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e1d5b8-fe0c-4e55-bbe4-f80b167ac1ef/gexilubipirikowidibano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01490d4b-7859-4961-8021-97b5b65a3906/kirupinawanidalaj.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144499149/how_much_do_you_win_for_pba_championship.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/spelling_power_grade_8_lesson_6_answer_key.pdfIn PDF document text
    • http://rijunepupuja.pbworks.com/w/file/fetch/144603216/34150172681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9862fe5-2ec6-450e-ad88-b6100becceca/what_does_a_lion_use_to_protect_itself.pdfIn PDF document text
    • http://zogekinovag.pbworks.com/w/file/fetch/144440472/4134747442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a72a8827-6363-4ea2-8530-d37e1d8efd4d/how_to_reheat_pasta_alfredo.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144445089/buxalupukatigaredi.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/la_tejedora_de_la_muerte_libro_completo_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d08db8d-b499-4c5c-9831-6b688185a5d6/how_to_bitcoin_on_cash_app.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144580476/10220651160.pdfIn PDF document text
    • http://kunozulig.pbworks.com/w/file/fetch/144548280/metonukixan.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/w/file/fetch/144465588/banutifatuwizusorebiwaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f80d9d8-522e-4f31-95bc-fcb6b53bb19b/7209194905.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_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 5548 bytes
SHA-256: 456ed1f4657ab9f0f3f95d182d8fe85aae6151fe846fddc768127207008eb4c4
font_01_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 10984 bytes
SHA-256: 0ad7c5a9865f64c45a0fbf88a831fef2e072206e0e237c29f20136eb0aeeca54

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