Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb603577f0375374…

MALICIOUS

PDF

82.5 KB Created: 2021-03-13 17:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fed92f0e6e1e707d9209f313f7f6ff4f SHA-1: bdd3edfe74fe25843e13327a36aa9d6845cacbce SHA-256: fb603577f0375374372ee683c6f8f1a5694753722f7bcd9549de105fe685e9a8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to academic search terms, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=algebraic+structure+theory+of+sequential+machines+pdf PDF link annotation
    • http://losmopaka.site/brian_carn_gayf3jr1.pdfIn PDF document text
    • http://sellamorem.com/kuralekad1t1ia.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ijarHig/zopupiwogasotitusubep.pdfIn PDF document text
    • http://italylife.pro/74639117808pdb2n.pdfIn PDF document text
    • http://muwazowezijowa.22web.org/xirexaraguzapa.pdfIn PDF document text
    • https://gogodelile.weebly.com/uploads/1/3/0/9/130969080/punarezasi.pdfIn PDF document text
    • https://selepofobalolu.weebly.com/uploads/1/3/1/8/131856949/risori.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/0SVAghs/candy_tomatoes_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/jxzgdnI/langrisser_mobile_redeem_code_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/MYheEei/elgato_stream_deck_mobile_apk.pdfIn PDF document text
    • http://zujavok.22web.org/4765577590.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bakadukepafim.epizy.com/how_do_you_clean_a_bersa_380.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/airtel_tv_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/among_us_hack.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_8f3f7fdac75e404f9cf018b52ddb3038.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_0e26e63e08334699b841b36428a6ab8c.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_0a95c4e8d10b4d2f8eabf4b81acde0ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/65978083844.pdfIn PDF document text
    • http://jajuzefob.rf.gd/menowur.pdfIn PDF document text
    • http://gowokuvatudo.rf.gd/shepherd_bushiri_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/abs_academic_journal_guide.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_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 5928 bytes
SHA-256: 286443ae4fd6d1bcbe486fba132ccb63b4a8063ba1bef5f715b99be7c0b4d744
font_01_sfnt_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 11808 bytes
SHA-256: 4eeca426ad07a38b9d0f9ec57909355112ebad45f39c1d4d7307845f67bccc41

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