Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d25270b89535996…

MALICIOUS

PDF

83.4 KB Created: 2021-03-10 03:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4812ce55230d6bf85e80e8dc4699c604 SHA-1: c3052d13a79cbbcb82bc09136f8df37159de4d4e SHA-256: 8d25270b89535996d640e427eae19cc36023d5fc123bbaa2c26f461929995098
106 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers as malicious. The 'Password-protected archive handoff' heuristic indicates the document's likely intent is to trick the user into downloading a password-protected file, which is a common tactic for evading gateway security. The presence of external URIs and a link farm further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ponafet.ru/123?utm_term=ubuntu+server+16.+04.+4+lts+iso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420434/normal_600d7da215be0.pdfIn PDF document text
    • http://sezidagajajam.iblogger.org/kaninuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_602e39d166470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufukajipopo.rf.gd/musejuxixexepajulebutet.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/pulse_secure_ssl_vpn_client.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/hebel_wall_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5d7672-d800-4e5f-9262-52de0542dc16/knex_ferris_wheel_instructions.pdfIn PDF document text
    • http://sozidaxaguzir.rf.gd/74830897054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f461e5-69ac-4b5a-a778-13d6281749d2/principales_caracteristicas_de_la_teoria_del_conflicto_social.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_3b0ed0f5d19641e093564661f4d5253b.pdf?index=trueIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_ac2e2789461c48fd9775872b07f3b517.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bf50d1-1b2f-42f5-913b-78539a3f2597/vobodavivivulak.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/tenefojeset.pdfIn PDF document text
    • http://rewerikipij.rf.gd/salukarilarada.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/instagram_videos_on_android_phones.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_d299f61dc24a4c2db8f448b5bf0cce09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/456a3418-89f1-48b5-b40d-c5eb7208a271/seo_for_dummies_7th_edition.pdfIn PDF document text
    • http://sugorotebego.epizy.com/21898092602.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 5128 bytes
SHA-256: ee92d91e87c05cf5d216fc9dc28288e625e818860c9f0ac978ad42584c7933b1
font_01_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 12876 bytes
SHA-256: 5548bf807bd4e6a50a440662cf6a3108ac7e9c62e555fa9193b7ca1f0c88d6b4

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