Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9bdaa75899b9f9…

MALICIOUS

PDF

74.9 KB Created: 2021-02-13 03:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8deef6e00a2fa8f2dd39e00a665e84ad SHA-1: 9d9dd3b8f8aa83bddaca1c790897322f1273f47b SHA-256: 7f9bdaa75899b9f94a5a2b4696426b649c0f77db538d06fdc1636b9261d50d69
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to potentially malicious or phishing sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring the user to external resources, likely for credential harvesting or malware distribution, consistent with spearphishing attachments.

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
  • 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=fortune+teller+online In PDF document text
    • http://ductsunlimitedins.com/geometry_dash_2.1_mod_apk_free_downlngyfo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_60181e11609e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377717/normal_600319e1c817e.pdfIn PDF document text
    • http://studyweb.site/82463926799znrqn.pdfIn PDF document text
    • https://cdn.sqhk.co/wediximewoza/ii6icEW/75497560542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459188/normal_601fd55fd15af.pdfIn PDF document text
    • http://opencabinets.xyz/kejixugujipejaruhwocz.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/bjjigRk/warlords_of_draenor_timewalking_mounts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_5fd38710841d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fcf2bd287d59.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/hjTiegh/joplin_ef5_tornado_path.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/jblidgc/dragon_idle_adventure_apk.pdfIn PDF document text
    • http://shopee24.site/apex_legends_stuck_on_preparing0d4sp.pdfIn PDF document text
    • http://mx50off.pro/trials_in_tainted_space_save_editorjge2q.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/tobito/dakaboxubiwibib.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/win_10_usb_boot_free.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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 4248 bytes
SHA-256: 687867141d2b8d13ae4ada87ed37cb313e4c84e6302f52713c248ec93fef83a7
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 10980 bytes
SHA-256: 33336fc37f50e6fd85f41d159a41c940d089a5675e58bf663b2be8244179d0e0

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