Malicious PDF — malware analysis report

Static analysis result for SHA-256 9383642a1d47ec11…

MALICIOUS

PDF

79.7 KB Created: 2021-02-28 19:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2adfa008a39d6ae87b42e09265b47385 SHA-1: 2f2718c2458961d44fad6901045264a54e527e64 SHA-256: 9383642a1d47ec11aba2751648efa6d0a09fce75d22ab30487bbba8cbbf4648d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF was flagged by multiple heuristics as a brand-impersonation credential phishing lure for Walmart. It contains numerous embedded URLs, many pointing to disposable domains or link farms, which likely serve as redirectors to a final phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nezikipinafuzis.weebly.com/uploads/1/3/4/3/134316621/94314.pdf.
  • 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://seumenha.ru/wix?keyword=graham%2527s+law+of+diffusion+worksheet+pdf PDF link annotation
    • http://jinoxiresajigeb.iblogger.org/national_lottery_bonus_ball_sheet_to_print.pdfIn PDF document text
    • https://nezikipinafuzis.weebly.com/uploads/1/3/4/3/134316621/94314.pdfIn PDF document text
    • https://tajuweselu.weebly.com/uploads/1/3/4/3/134362517/dipizatezebasaziw.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/roland_td_4_price.pdfIn PDF document text
    • https://lurakowufo.weebly.com/uploads/1/3/4/4/134457973/nogerigoxag_bejog_sefexukup_lipanaruxipa.pdfIn PDF document text
    • http://zemawage.22web.org/equitable_distribution_worksheet_georgia.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/idicjfl/simplenote_android_apk.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/jufojojeresananabojifele.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/dXjagip/50562896050.pdfIn PDF document text
    • http://fixegemixinazoj.22web.org/99792760248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipudovisubu.rf.gd/12_tamil_sura_guide.pdfIn PDF document text
    • http://kokamusosimabo.rf.gd/hungry_shark_mod_apk_dayi.pdfIn PDF document text
    • http://lirepotinemos.rf.gd/44770701907.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/70901637450.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/korexep.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/42152437538.pdfIn PDF document text
    • http://resaralamefevep.epizy.com/39296811517.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_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 5504 bytes
SHA-256: 8742a75e999cbc80fbf78f00aafa0cad004faf57fa56ccac08505a02b768b288
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 10676 bytes
SHA-256: 1b9cfaa29acc09447c5c85c372ac97d313ec6e50eec1ffac68820903c12b2fae

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