Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1aaf8240447477…

MALICIOUS

PDF

149.3 KB Created: 2021-03-02 13:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e7deef83f159a93252d17d80dd09a0a5 SHA-1: 1340fb8b62cfebce7534f26122aee2433f055609 SHA-256: 3a1aaf824044747767930bf426816668d86bd96aed55691e3d2012f5f7b7d36f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. Several external URLs were extracted, with 'resalured.ru' being a primary indicator, likely serving as a download or redirection point for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://resalured.ru/wix?keyword=gene+and+chromosomal+mutations+worksheet+19+answers PDF link annotation
    • http://flymoney.net/financial_institutions_management_9th_editionj5jqn.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/presonus_firepod_firewire_interface.pdfIn PDF document text
    • http://arfeshome.com/good_morning_tamil_photos_hdkk7vg.pdfIn PDF document text
    • http://zemegazi.22web.org/garixal.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/zodumexefoko.pdfIn PDF document text
    • http://procripton.com/89851738991z93me.pdfIn PDF document text
    • http://goligofalu.medianewsonline.com/what_are_the_disadvantages_of_mobile_phone_in_hindi.pdfIn PDF document text
    • https://penonogam.weebly.com/uploads/1/3/4/0/134012545/2839303.pdfIn PDF document text
    • http://electriccannoz.club/14513542654qr878.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/217cb06ea.pdfIn PDF document text
    • http://motivawka.online/samples_of_good_scholarship_essays1q26j.pdfIn PDF document text
    • https://lutilizifaguno.weebly.com/uploads/1/3/5/3/135316604/bekapedusamajizu.pdfIn PDF document text
    • http://istlan.space/432019393006i52t.pdfIn PDF document text
    • http://presente-top.store/bawapujijidemxg455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kifarir.rf.gd/psp_emulator_for_pc_windows_7.pdfIn PDF document text
    • http://jomupaz.myartsonline.com/when_should_i_read_demigods_and_magicians.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/urolithiasis_treatment_guidelines.pdfIn PDF document text
    • http://topukonas.rf.gd/89134672503.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/suzowenozisoluze.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/dudujuzavilurujewozamudu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20021 5456 bytes
SHA-256: 23fe13f7e945189396b90b1bff3c00c3814a4b35650ad20b5e848ba7c9921170
font_01_sfnt_off00021293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21293 11248 bytes
SHA-256: 53b651d04ad7cfa8a38d4ebcd833dcef4cc3b705a2ff46e860a6a788c0fe4481
font_02_sfnt_off00023895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23895 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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