Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3ea787cc5a83e1…

MALICIOUS

PDF

75.7 KB Created: 2021-04-02 07:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8282ed571730756c776119a3d8109bfa SHA-1: a7fea9f7162fb82d48315f5e277d2907d7cdd371 SHA-256: fc3ea787cc5a83e19b865fdb6798cee94f5e1d54f6622a71f6f42d0439e47f19
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, which is characteristic of SEO link farm abuse. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://seumenha.ru/strik?utm_term=hayward+aqua+plus+wifi
    • http://hookup757.fun/john_hopkins_antibiotic_guide_2017utign.pdf
    • http://verification-help.business/karcher_gas_pressure_washer_problems_pulsing3y5e6.pdf
    • http://gifudevuf.iblogger.org/netball_attacking_drills.pdf
    • http://wexakevo.22web.org/fuwimise.pdf
    • http://kinorio5.xyz/luzisafewowue4b23.pdf
    • https://cdn.sqhk.co/zegetaru/hgficid/70052669944.pdf
    • http://goshop32.site/10_frame_langstroth_beehive_plansn4z67.pdf
    • https://cdn.sqhk.co/telapunojawu/hgjcgid/24176647263.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fupanabivote/bivogofibijosamodupe.pdf
    • https://s3.amazonaws.com/donukadizolin/sumiju.pdf
    • https://s3.amazonaws.com/tojazudibumogab/mathswatch_ratio_homework_answers.pdf
    • https://s3.amazonaws.com/jufowokedunod/devojimuxojotolonixoxux.pdf
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_24422b7c1c014d66acd6a482a7ffe966.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/ielts_7_listening_test_1_answer_key.pdf
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_986c81ba0dfa40b1b5597abfb9cdcbb3.pdf?index=true
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_fa0d814d97b242cbbbb7f85b14cbcf2c.pdf?index=true
    • https://s3.amazonaws.com/sonutopexaramuf/cpm_ebook_homework_answers.pdf
    • http://digifasofow.rf.gd/reduce_file_size_quartz_filter.pdf
    • https://s3.amazonaws.com/rezugekolaba/67227479990.pdf
    • http://xuwinesesat.epizy.com/niv_study_bible_notes.pdf
    • https://s3.amazonaws.com/roxawo/83165858803.pdf
    • https://s3.amazonaws.com/gagagakigibapo/barilla_ready_pasta_nutrition_information.pdf
    • https://s3.amazonaws.com/nuxepiduded/dreamweaver_software_free_for_windows_8._1.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11a.bin
ed41f13b99585bcac18fc71aef0e1be3feb86c372a08e2570719ef3e600c2c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 4784 bytes
font_01_sfnt_off0000f170.bin
a439ed705ae03eba79d5db7461728a4aaab189341d54b5afafda99563fffea5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 11600 bytes
font_02_sfnt_off000118c4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C4 4324 bytes

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