Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d14008770a178b…

MALICIOUS

PDF

72.1 KB Created: 2021-03-18 21:19:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7676d50a5977dbce81d7cc69736bcda6 SHA-1: 76cb4d960952b041fd1e1a67cb0afd08bccec405 SHA-256: a1d14008770a178b77ed4e2fba74cb70ec4fc8632fa83532cb5397be5f2f6b90
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to exam review materials, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/award?keyword=agriculture+board+exam+reviewer+with+answer+key+pdf+philippines PDF link annotation
    • http://tersq.fun/jegivaredtt5w.pdfIn PDF document text
    • http://totalcreditcheck.info/69018329462igy4v.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/asciidoc_header_footer.pdfIn PDF document text
    • http://siankaanmexico.com/fifth_edition_character_sheet_app_warforgedrekz6.pdfIn PDF document text
    • http://itdiscounts.info/kivutopoxuzanul2g5bt.pdfIn PDF document text
    • http://biotringel.shop/13177474526xfnog.pdfIn PDF document text
    • http://cocobuka3.xyz/assault_cube_2_portablexyisj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421613/normal_6000eabf7ccf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_601ae89890238.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/11357100439.pdfIn PDF document text
    • http://twitter-center.com/d_d_4e_online_character_sheetrgg8r.pdfIn PDF document text
    • http://herss.space/mowojawixavajurazagaphnu9i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_600de1265736b.pdfIn PDF document text
    • http://vufilulojusabid.iblogger.org/color_black_worksheets_for_preschoolers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376610/normal_5ffe62f90699c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikigefunix.epizy.com/sri_lanka_army_photos.pdfIn PDF document text
    • http://zaxuzut.atwebpages.com/tufezosexijijigimivomub.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/how_to_clean_keurig_2.0_k200.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_off0000d8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DE 6084 bytes
SHA-256: 47eab7161926432129df313cae8473a3161d9e22c212fac9330361c7aa211dae
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 11316 bytes
SHA-256: 30fac523bc656e18af02e3dbd15154bded4d8a6abf498ca5c16957279778d772

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