Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba2aed83a4fd682…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 14:29:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f6aec6397e9a42f1527698a13fb29bf2 SHA-1: 8fac9377ffe4003058678b41da4781e8bc702a95 SHA-256: 0ba2aed83a4fd6820336a477a20c4f025c4b8fed9a2b8ec21cf44555f40412cb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=curso+completo+de+economia+pdf PDF link annotation
    • http://trikolor.site/doxozixeliw66ogw.pdfIn PDF document text
    • http://e-devletodeme.net/88512749149sce6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_5fdc74b80f078.pdfIn PDF document text
    • http://sodalabs.pro/harbor_breeze_remote_quit_working0o3t4.pdfIn PDF document text
    • http://hellesypakk.online/why_is_recycling_water_so_important9hcav.pdfIn PDF document text
    • http://worldworkbook.com/jelekiq388y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_602fdce7bc767.pdfIn PDF document text
    • http://irisca.online/21395370760xekvy.pdfIn PDF document text
    • http://fsbsiod.com/jawaxumimopofikoslny5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_212f0342beaa44fba6df5e189f321243.pdf?index=trueIn PDF document text
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_8dbe1cd88a8e4040bb2e0a7d09eefdde.pdf?index=trueIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_5c9f44e650bb408b9924e93d0078a653.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_602262e174914984abe6090969a81a51.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_bcaf36e45b5b423a938454643b5b6367.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_cd98e06469a24c6ebf80d12e0e364fbf.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_0e4492e3e3e3485b9f30d4a79c2bec75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cff5b89-0092-40fc-ae12-6c59edda126e/auvio_wireless_headphones_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee15d36-acea-4cbe-9503-64d745761ff6/kepagitonapozimugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b34ed77-d045-4b30-b557-6d7d7e5a7ad3/what_is_the_purpose_of_the_victorian_criminal_justice_system.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_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 5208 bytes
SHA-256: 873e23d4cd449f7d6221414551e3d0ec1a100612bde15709194b7a4dcad51dd0
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 11176 bytes
SHA-256: 4629b36a343dda30402d3b71e91e5959d7f496fef7307d34f9d156248e763e65