Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e58f92e51e86fd…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 02:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b9912a8dfbdeb73c0186b38f9881301e SHA-1: 0254a93e36e02f6cdd26fdb42f91d4f587c489cc SHA-256: 73e58f92e51e86fdcbf759980863789143206f2d6e1fd52e8dd33d56a84445d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://fokemale.ru/wix?keyword=corso+riggs+romance+guide PDF link annotation
    • http://xijonope.iblogger.org/ximapuxexepizaw.pdfIn PDF document text
    • http://tamakedesununod.mywebcommunity.org/what_is_graphic_design_all_about.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_5fd1c60f015d6.pdfIn PDF document text
    • http://xosopinogagon.iblogger.org/good_bye_image_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471234/normal_5fedf861909b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_603d2ea303b8e.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/atharva_veda_in_telugu.pdfIn PDF document text
    • http://zisujetev.iblogger.org/battle_dogs_mod_apk_rexdl.pdfIn PDF document text
    • http://wuxakex.iblogger.org/calvin_and_hobbes_complete_collection_ebay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5fe7101ed73a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/legubivofeserejenemaw.pdfIn PDF document text
    • http://sirevonigira.epizy.com/rutherford_backscattering_spectrometry.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_5e46c86f83e14db3a67ceb3fd8828b4d.pdf?index=trueIn PDF document text
    • http://pinakebe.rf.gd/alcatel_lucent_4018_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/63008870231.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_07604ee397e7457b9eaf9bb269eea253.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/38095872907.pdfIn PDF document text
    • http://kijijaxozaro.epizy.com/4th_grade_math_worksheet_word_problems.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/sosap.pdfIn PDF document text
    • http://xekofelix.rf.gd/super_mario_sunshine_delfino_plaza_shines.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_7983c432fa2445fe990084c162cfa97f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/gta_vc_cheats_for_android.pdfIn PDF document text
    • http://damabop.epizy.com/ssc_stenographer_online_application_form.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_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 5132 bytes
SHA-256: 1cbb20378f247dc2d9f377141351fb33389171fbb9ce9ad418d6da4e66624946
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10820 bytes
SHA-256: 22830ecf156dd5c768a3afc6481b03b89b0f7881fc3df7184e5a52a690bbdc98

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