Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93c8076d5ba6773…

MALICIOUS

PDF

109.7 KB Created: 2021-02-27 23:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b6594ff549e89796ee9d48436a28297e SHA-1: ad0fba56a7045927bfc988e481ae685fb14cc7f9 SHA-256: f93c8076d5ba6773008bdab8ba55c6b6399def0e341f361fea24c2c1b1bce6f1
126 Risk Score

Malware Insights

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

The PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though partially corrupted, references 'Antigone scene 1 ode 1' and the file's metadata indicates it was generated by wkhtmltopdf, suggesting a potential lure. Numerous embedded URLs, including those on disposable hosting and link farms, point towards phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/aws?utm_term=antigone+scene+1+ode+1 PDF link annotation
    • https://cdn.sqhk.co/zarepowake/8hgjhij/nopudusodubolinozamufu.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/Utjhaz2/mimpi_digigit_ular_di_kaki_artinya.pdfIn PDF document text
    • https://cdn.sqhk.co/nadokikado/hkhhHdv/71623760920.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/bbULgfY/hacker_prank_simulator_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/ididigf/how_to_play_among_us_on_computer_controls.pdfIn PDF document text
    • https://cdn.sqhk.co/godidudawat/Ow8mzid/unnatural_synonym_english.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/dbhzgdV/65427523385.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/cuisinart_dcc_3000_12-cup_on-demand.pdfIn PDF document text
    • http://mevilesiroxivo.iblogger.org/aspirantszone_di.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/gravity_falls_journal_3_blacklight_edition_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/sapamine/eIjchiV/labebevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/30388838705.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/adobe_photoshop_background_templates.pdfIn PDF document text
    • http://vexidolovosope.rf.gd/aadat_tu_meri_song_status.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/jubefajikikalaxu.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/avira_android_apk_full.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_off0001587f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587F 4808 bytes
SHA-256: 618bf79c1ee61b9031d4c358ca087c52d67c11ed2b23b6f104bd959aac9ada2a
font_01_sfnt_off00016902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16902 12008 bytes
SHA-256: e899a393c28ee1716e61ea17f3dd21e7c6f8539d6af9352a058a87f7a7944bd5
font_02_sfnt_off00019056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19056 17252 bytes
SHA-256: 0121d941ed483a243858e1cdaca46b211b22c2862b61e1ba6a896148da506f53

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