Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90878443154b11e…

MALICIOUS

PDF

87.7 KB Created: 2021-02-20 00:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3913a9eec6fe5ddab4be0cced825900 SHA-1: db0e8d1939377ada4db66aaf7ba80f8dcf1b2136 SHA-256: b90878443154b11e21d5dda8bcbd61c24057b9a33d0d75ddce6081c101e5c8b7
66 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly suggests maliciousness, and the document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the lure. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://jottigo.ru/wix?keyword=cfg+loader+wii+descargar PDF link annotation
    • http://copyrightsupporteds.com/setelixujaladsgsmi.pdfIn PDF document text
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/3734381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5ff1486d65f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_5fd31d227b37b.pdfIn PDF document text
    • http://reduslim-officialsite.site/my_immortal_free_piano_sheet_musicshzb6.pdfIn PDF document text
    • http://jewlgems.com/wisabazagogafisuwi2cbhk.pdfIn PDF document text
    • http://my-favshopd.online/29139591173r348k.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/OjjghiL/12422753831.pdfIn PDF document text
    • http://klokisik.space/is_there_a_nintendo_theme_park1na0t.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/DFjivhc/xubepezajeroz.pdfIn PDF document text
    • http://insurancesouk.com/lokojinobigukupejy43qz.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/beeff3553.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/igiiagK/real_stickman_crime_unlimited_money.pdfIn PDF document text
    • https://nazumuliwoj.weebly.com/uploads/1/3/1/3/131383416/97439ef1ad5a.pdfIn PDF document text
    • https://vibomasovig.weebly.com/uploads/1/3/1/0/131070198/vazosomusefelixowe.pdfIn PDF document text
    • https://zapufotipo.weebly.com/uploads/1/3/2/7/132740892/7813112.pdfIn PDF document text
    • https://dunipilulu.weebly.com/uploads/1/3/4/8/134880259/0993b8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_600a832c721aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5fc8bf28e58b2.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/4404453.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/bieigfh/supirerinagomosoxuxi.pdfIn PDF document text
    • http://com-servers.online/jekigitu0cpi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 5188 bytes
SHA-256: 486ec80b68561e286c8e932eb32e141ec169feba5c219454cdd4b75b7d0b853b
font_01_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 10420 bytes
SHA-256: 5baef689c19b6659a78e490285e2f6b5f5805bcb58a2e0654a1249038225de98

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