Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15cdd408041f9da…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 15:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 61982823073d81dd90ed56ace378f5a2 SHA-1: 0711d4d9be6b4a8f80f32a0e9990a641ab7524ef SHA-256: f15cdd408041f9dab874898a1a989837fb787a4e56418b2a29a52961f9d7ab86
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL pointing to a domain associated with phishing lures. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=2019+to+2020+fafsa+pdf PDF link annotation
    • http://lnstagramverificationbadge.com/pediatric_nurse_practitioner_certification_review_guideo9bhe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5ff23768c7f2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5ff407b159b33.pdfIn PDF document text
    • http://brettlockhart.com/movie4me._com_bollywood_2019jodb6.pdfIn PDF document text
    • http://phulop.store/wixawigugoragisifoku616.pdfIn PDF document text
    • http://kubodir.22web.org/mupexes.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/10516078105.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/belajar_bahasa_mandarin_sehari_hari.pdfIn PDF document text
    • http://wajoxur.22web.org/penatalaksanaan_anemia_defisiensi_besi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490929/normal_604502ed9961f.pdfIn PDF document text
    • http://mifozipoz.22web.org/91557359113.pdfIn PDF document text
    • http://daating19.site/1993_jeep_wrangler_manualbcw6w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be658bfa-0bf7-4b5b-88b3-2ef0f9b73509/duzopu.pdfIn PDF document text
    • http://naxixexofeveto.epizy.com/seben.pdfIn PDF document text
    • http://refowokewip.rf.gd/wakunavubepas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a2fc4f-3ce0-48c3-bf1b-681c6a12e203/kerex.pdfIn PDF document text
    • http://likitaponuviv.rf.gd/fire_detection_using_image_processing_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c337e9a4-6b2b-422c-958c-5d349b051d52/taurus_800_series_45.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4d7787-3e7c-4ff7-ba23-5d4abb3c1cca/how_to_learn_arabic_language_free.pdfIn PDF document text
    • http://ratesedefavure.epizy.com/88434515750.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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 5296 bytes
SHA-256: ca1f5ece49e06314e3afe81d54803bbb9173ee7aa65b9439a964ad53f204b4c3
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 10584 bytes
SHA-256: d6b8fb90df3b1b0196bf8b035811cde244c8e7bc586b5c3ad3427ab2da9a3a9c

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