Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b86303cacfb164f…

MALICIOUS

PDF

68.5 KB Created: 2021-02-15 14:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2e143d9ba9293308b8c3a4e1214ccc30 SHA-1: 26eddb487b6d587e8e62127c2c4cdc577ace12c3 SHA-256: 9b86303cacfb164fb94dd5efda9027dfdcb006f798d85652cbd00d2f68e0b899
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains a URL that mimics a search query, suggesting a phishing or social engineering lure. The presence of embedded URLs further supports the malicious nature, likely leading to a second-stage download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=how+much+does+a+croquet+set+cost PDF link annotation
    • https://cdn.sqhk.co/kurafuso/jKJFwgc/xapezerodevores.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/ggihfjc/pocket_classics_cars_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/EidgiUt/dead_zone_action_tps.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/ihhDheZ/43222958358.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/iRhggfW/81049179897.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/jeughUR/cookie_clicker_2_cheats_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/gidhgij/gulotif.pdfIn PDF document text
    • http://shortsomfj.space/61277976672nj4du.pdfIn PDF document text
    • http://verifybadgesbusiness.com/assignment_problem_in_lppiqz5y.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/jovekus/chhath_puja_song_dj_shashi.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/diffraction_grating_physics_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/blood_pressure_chart_uk.pdfIn PDF document text
    • http://zelubosomud.rf.gd/how_to_backup_iphone_notes_to_android.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/xoxewomimavotu.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_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 5324 bytes
SHA-256: 3cdfac8e3047296d9fee16025008ac262302a49e9a98edaa40c2d4734b9032c3
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 11176 bytes
SHA-256: ba34b103e82745943c7a6a7be33356c860fefda83fc2de0bb928343b8b06f135

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