Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9bd7df721f9668…

MALICIOUS

PDF

75.2 KB Created: 2021-02-13 05:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: edd0699b6df9f0f233c409a749a6fea9 SHA-1: b381d17f6a5b39b45c7aa9e422a1f5d11ee72706 SHA-256: fd9bd7df721f9668c83d6b8bd87305987f9fa7b2f7b1bd40d53bba67bf327482
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, flagged as a malicious redirector and link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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=shakes+and+fidget+fortress+guide In PDF document text
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/fipute.pdfIn PDF document text
    • http://opencabinets.xyz/entrepreneurship_mindset_curriculum_frameworkar5tg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_60174f65b06c2.pdfIn PDF document text
    • http://vemasujananexu.22web.org/43553231678.pdfIn PDF document text
    • https://lolovegadagofi.weebly.com/uploads/1/3/1/6/131636941/viganomewumunew.pdfIn PDF document text
    • http://microdigitalmeter.xyz/marketing_internal_audit_reportlqhqx.pdfIn PDF document text
    • http://kozevajalun.22web.org/cbcinnovis_credit_report_inquiry.pdfIn PDF document text
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/f9878a4.pdfIn PDF document text
    • http://xonibiz.22web.org/ave_maria_bach_gounod_sheet_music_cello.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumebef.epizy.com/32355128523.pdfIn PDF document text
    • http://kajomeki.epizy.com/synonyms_and_antonyms_examples.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/34605291459.pdfIn PDF document text
    • http://ruxofepugoloma.rf.gd/selaji.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 5304 bytes
SHA-256: dbecc4adf0d9241824758cb636395b4497075fa0a0a5bb12df82e5cc0cf8dd08
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 11412 bytes
SHA-256: 313e42601af18c2cee75f14b2ed57b4eb2379fe04dc9d85219a7298646544bb4

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