Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cddcc2949e3466…

MALICIOUS

PDF

77.3 KB Created: 2021-03-31 15:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 95df0d5212930f51952c04ee57e9ef15 SHA-1: 526997d25425e0d6ad59391ab8d34fd45c7a97f1 SHA-256: 38cddcc2949e3466d30d777e774b48dc4ba91c1d472372ed75a1c2eef51e3f93
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://crophysi.ru/award?keyword=encyclopedia+of+life+support+systems+eolss+pdf PDF link annotation
    • https://kadeniki.weebly.com/uploads/1/3/4/0/134097858/tujawukirawodisuw.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/15049376950.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/char-broil_patio_bistro_electric_grill_with_tru-infrared_cooking_system.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/7845215.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/gewaxibokadipoduvobuli.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/when_to_perform_causal_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_fa65e3a3b1464971a082ad1fe3132a74.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_3ba65bfc512d497e8f5a13b4c758251e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/fodosinosedulujam.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/51243834425.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_5be54ef77f254a6fac080fcc7b50ddae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/ge_dehumidifier_70_pint_filter_cleaning.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_a65ccba0a22c4787be44025a0d0b977a.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_ddd4c52de21249babfa1a6f426c17b27.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_0fccdfd6618d4aa0ada097cbca5a9e09.pdf?index=trueIn PDF document text
    • http://nezebur.epizy.com/red_rising_tv_show_2020.pdfIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_d528b98609364a9d81ddbc2edcc7acb0.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_9e60b0b205a5457db672debf6917e29b.pdf?index=trueIn PDF document text
    • http://vulofuza.epizy.com/64945956823.pdfIn PDF document text
    • http://zugujegezamuto.epizy.com/how_to_run_guided_math_groups.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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5360 bytes
SHA-256: b6ec37204c3d400092d9116f57806f0d198611a8d5303e053094284696b884a7
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 16156 bytes
SHA-256: dcc0cfbb54d68660014cfd6bc2785e24c360683f029f3a92e2b9335401b3a78b

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