Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb2deeb45cc8b62…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 17:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fe163cac8d42f0f16335570a3a1fb23 SHA-1: 516f3da02951c2cef95b4d6105f8cc44e36a78f8 SHA-256: 7cb2deeb45cc8b626601c4f32ddc743c4adac5c488fb94cce29587b73390a3a6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. ClamAV detected the file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The presence of numerous external links suggests an attempt to drive traffic to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=mastoiditis+cronica+tratamiento+pdf
    • https://cdn-cms.f-static.net/uploads/4460473/normal_60120840f0b06.pdf
    • http://lewijufe.sportsontheweb.net/function_of_arithmetic_logic_unit.pdf
    • https://cdn-cms.f-static.net/uploads/4489988/normal_5fe7630d20480.pdf
    • http://laludinemolat.sportsontheweb.net/john_deere_214_garden_tractors_used_for_sale_in_illinois.pdf
    • http://tiwimifozukimu.medianewsonline.com/74214814379.pdf
    • http://nanebaxexob.getenjoyment.net/xegegofividodomufa.pdf
    • https://cdn-cms.f-static.net/uploads/4371272/normal_60255aca749ca.pdf
    • http://juzezudusota.mypressonline.com/what_is_the_definition_of_an_llc.pdf
    • http://dotixomovi.sportsontheweb.net/switch_statement_c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_f045649071914060b545377d357d8a1a.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_d39456e4634b4931baf7bb9b46d094a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a21b88f2-9233-4f48-9ab3-6c00a758675f/cookworks_slow_cooker_instruction_manual.pdf
    • https://uploads.strikinglycdn.com/files/e03eef77-ebba-458d-8a0a-2179ed217d2e/a_cuanto_equivale_10_pulgadas_en_cm.pdf
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_afb6b56a33ec4a20977409b12e3f51ce.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_d3ec920a9a9c4e3a9df67e0faac7277a.pdf?index=true
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_ff7bcba3efd24ae298dc81c26a203957.pdf?index=true
    • https://uploads.strikinglycdn.com/files/518e102c-3642-4b4a-ace8-81af03fc5edc/futetapowitid.pdf
    • http://sulorowanutabu.atwebpages.com/calotropis_procera_medicinal_uses.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_36c27cbbc5fd4e129b330120fc980284.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a977108b-3bf3-4b67-bae3-55e9386d3833/76735001254.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_0ba0cf0e52ef4689a82f4bddbe672560.pdf?index=true
    • https://uploads.strikinglycdn.com/files/55082214-b001-4520-9a10-57a6dbf4b7a0/name_the_11_body_systems_and_their_functions.pdf
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_1a373cc9c6dd41a2920503252beb81b6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3da.bin
3efd74534ca79122d5b509871774a5ca8bedb35c7c0e97581e6eb7e1d60104a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 5276 bytes
font_01_sfnt_off000105bf.bin
8773805ab6fcf725a4e89d7fdee53e0b232fa481d751bbe720ed2df49619a78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 12168 bytes

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