Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79264edf58d5342…

MALICIOUS

PDF

72.0 KB Created: 2021-02-23 00:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 746f1410e700cb1bc1fa4c58300cffa4 SHA-1: 912541411b326c8472301bab817bf8246e6b881d SHA-256: b79264edf58d53424d5235ec86379f6515822351b1647c4e3f8e3a7a28d7e848
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to deliver a second-stage payload or lead the user to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=catholic+serenity+prayer+full+text In PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/6656767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5ff85538def90.pdfIn PDF document text
    • http://hisgohar.site/muwitadowaxubarupotzhkd.pdfIn PDF document text
    • http://tehnotop.site/valokopyjy.pdfIn PDF document text
    • http://livecopyrightverification.com/80202633022uuler.pdfIn PDF document text
    • http://redita.fun/anne_frank_powerpoint_tesfloa0.pdfIn PDF document text
    • http://natlegend.space/mitekiwomagetadurituz3l8i.pdfIn PDF document text
    • http://testvvd.xyz/34292466547drwn9.pdfIn PDF document text
    • https://cdn.sqhk.co/lokojagivel/bhahhhh/padaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_602498d9b4768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476011/normal_600179fa572d2.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/YhhiixU/69696411434.pdfIn PDF document text
    • http://gufutaca1.xyz/guvafujifonagilupidegpbfj.pdfIn PDF document text
    • http://fitdieta.com/lasagna_sheets_without_pasta_makernadgo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_6024497d1b2e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 5176 bytes
SHA-256: a3ea7f51d6f3463c056c813671990995c1f381e8da71db9344cbe5e374f6b09d
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 11540 bytes
SHA-256: 32df357978a8642a750669e1c9cf68d7581f2c9116630983ee490242b92bf2cf

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