Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c6df7c62b385d5…

MALICIOUS

PDF

75.9 KB Created: 2021-03-03 17:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 898841a7437e3bf3f27007ae711a07e3 SHA-1: a1f72fe03d20697ee2c0664ab565b6a39e6129ad SHA-256: 26c6df7c62b385d567f839b4c99a561836be28b825c01dcf0af6d8e0a160cfc8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was flagged by multiple heuristics as a credential phishing lure impersonating Walmart. It contains numerous external links, many hosted on disposable domains, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to phishing pages.

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://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/sivukigal-katizemi-terowumif-renolepat.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://druttle.ru/award?keyword=how+to+become+an+international+business+lawyer PDF link annotation
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/sivukigal-katizemi-terowumif-renolepat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393893/normal_5ff8836a47833.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/f6532.pdfIn PDF document text
    • http://megantv.site/fubuwunen4tdrk.pdfIn PDF document text
    • http://laitlabs.pro/why_is_my_hoover_tumble_dryer_not_heating_up9l3ng.pdfIn PDF document text
    • http://jasapremium.xyz/75214924963z00hw.pdfIn PDF document text
    • http://onenature.space/segmentacion_de_mercado_philip_kotleeqcvl.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/hiicHia/8144569633.pdfIn PDF document text
    • http://vekvelo.ru/formation_logiciel_piste_5.057fvd2.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/1e2fc2b94a.pdfIn PDF document text
    • http://present-mag.ru/bajuzadudoylifr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fd95aea2b94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_60172fa5b56e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwesupaletutu.epizy.com/24049143585.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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 5240 bytes
SHA-256: fa9d526fc1687cbe266c2a2acf74cdd080998b8a355f15cc306df3603b6e9b35
font_01_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 9976 bytes
SHA-256: a37b4aa92867e7e1c6361ffcfdb727429f4d3365b46e4be4811604ea714e2952

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