Malicious PDF — malware analysis report

Static analysis result for SHA-256 da86f0004f1ec999…

MALICIOUS

PDF

72.3 KB Created: 2021-04-01 14:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0761c02fa33b5676aad6276765d8a958 SHA-1: 21eb483922457ffd19c15d4604d1c488aab1564b SHA-256: da86f0004f1ec999f6795049bdb1796a0f40b0bb68814646e8fc7e5af4428f8b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with a heuristic identifying an external URI. The document body, though heavily obfuscated, contains text related to 'construction detailing pdf' and the wkhtmltopdf application, suggesting a lure. The embedded URL points to a suspicious domain, likely serving as a download source for a secondary payload.

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://xajibur.ru/award?keyword=construction+detailing+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392647/normal_60592d7851d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5fdb62e48b9dc.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/neil_gaiman_masterclass_watch_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/ge2N0jj/stickman_zombie_survival_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kakumipoman/xgeicjd/friv_flash_big_battle_tanks_game.pdfIn PDF document text
    • http://trysalon.xyz/unit_4_solving_quadratic_equations_worksheet72sec.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/hifgftz/crossfire_volleyball_minnesota.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/gjib9vH/lion_king_remake_runtime.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/3ZEheC4/10479672163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_6057fb84780c8.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/ilpa_template_lpai1juo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_601612345ae47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_604133f4d1a83.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/hacihic/piggy_book_2_characters_roblox.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/gasodamuza/xokuxaveratoj.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/annotate_free_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/83348049854.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/how_to_save_picture_in_paint_with_transparent_background.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/bronchite_aigue_asthmatiforme.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_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 5228 bytes
SHA-256: 49aebec5efbfe49ecfa685e47a9480bda512803184062a3fcfccc3c7e9aecb6f
font_01_sfnt_off0000f186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF186 10168 bytes
SHA-256: d12891d7214c43d617dcaf697b8ef0e88a54f2b18f450f3257ff15dc6399db85

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