Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84d508131fc8990…

MALICIOUS

PDF

77.6 KB Created: 2021-02-11 00:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0f14e8ed987720b794f8bcdcfd323b06 SHA-1: 3cad4e47b3a6465028a98375f9af43999f7b4463 SHA-256: f84d508131fc899020c8b8b09bf90f8b9595371433ac12452a1764272e84dedf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly suggest malicious intent. While no scripts were extracted, the sheer volume of suspicious links and the ClamAV detection point towards a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=13+inch+tires+walmart PDF link annotation
    • https://cdn.sqhk.co/fazovivum/gjdjh5w/lowercase_capital_fund_1.pdfIn PDF document text
    • http://dojaligiwojop.22web.org/xiwomavusufoginaxat.pdfIn PDF document text
    • http://tiwikif.22web.org/64507163821.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/bjiZbwI/dusej.pdfIn PDF document text
    • http://photoforce.ru/345621019909bw9g.pdfIn PDF document text
    • http://com-signto5.xyz/forefswwv5.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/Tyy6ejc/47701195164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_600f3956adf01.pdfIn PDF document text
    • http://kersita.space/tinobujividatokob1pta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5ff13d1195f6a.pdfIn PDF document text
    • https://cdn.sqhk.co/foxuninulini/hhjphd6/25423969149.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wavujeg.epizy.com/56972757450.pdfIn PDF document text
    • http://vaguwiraji.rf.gd/50384019699.pdfIn PDF document text
    • http://meluromotav.rf.gd/reduce_size_macbook_air.pdfIn PDF document text
    • http://zuxakenupe.epizy.com/80381419899.pdfIn PDF document text
    • http://fidusigugowubo.epizy.com/bfs_company_full_form.pdfIn PDF document text
    • http://lodanije.epizy.com/hmrc_business_income_manual_use_of_home.pdfIn PDF document text
    • http://fegumipidibig.rf.gd/35932416097.pdfIn PDF document text
    • http://negemabubitaso.rf.gd/23423932022.pdfIn PDF document text
    • http://gajovab.epizy.com/98438781566.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_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 5252 bytes
SHA-256: c75338ab81e5719499124f40720afb9ccc309a7a76ff9efa97dfa9bff7b7c70a
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 11396 bytes
SHA-256: bed116ce65118f64c63d19744d67bc90e3c6a92714254763d513f9a79a9789fb

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