Malicious PDF — malware analysis report

Static analysis result for SHA-256 987a9e6ba20dafbd…

MALICIOUS

PDF

88.1 KB Created: 2021-02-04 19:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d3bc16d4f02d5a5c09a708eb7286649f SHA-1: 14fd556e11d882740f266b24825fa3ab7b365382 SHA-256: 987a9e6ba20dafbdc3fb04c8cc7198545ef05294b826b997ae22c6086f5c0853
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The embedded URL is likely part of a phishing or malware delivery scheme, masquerading as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/wb?keyword=adding%20and%20subtracting%20fractions%20different%20denominators%20worksheets In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407306/normal_5fe097c56e3cb.pdfIn PDF document text
    • https://cdn.sqhk.co/nubalevuvem/jijib8I/idle_island_mod_apk.pdfIn PDF document text
    • http://neo-tp.ru/11912497918dhmxx.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/tDhc0MB/lawuridiseruk.pdfIn PDF document text
    • http://trokot-newshop.online/91338867790387si.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/jegepji/los_simpsons_tapped_out_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/heroyhh/52023637174.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/jaijazm/pulling_usa_2_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5ff68baa75a64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_600f737dc1724.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/gBLgh0a/pew_pew_pew_lyrics_tik_tok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5fd89e51a54c2.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/mudurixo/admiralty_primary_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/additional_information_to_add_to_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/12204263411.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/31076389179.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/kmspico_2018_windows_10_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/cablevision_flow_apk_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 5688 bytes
SHA-256: 59007aa42fcb6ced8c691f6f71e54c935d9a55e5ce98fd8a9cb2966cd11a3644
font_01_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 10468 bytes
SHA-256: 2564576be3e80f1bf6128c12c3df2c75de226e3b975ec2f35482295d0175eb9d
font_02_sfnt_off00013cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC4 16176 bytes
SHA-256: 014496cdc810fd36dc51373d3c14121957e6ae8be2c217d958fed9d6b2e26cb1

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