Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf7313f593e62f4…

MALICIOUS

PDF

75.9 KB Created: 2021-03-11 19:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 189c5ce001508f2276cb0da95d2de339 SHA-1: db9ea0f7b0094abacf8bced326e634a04f4c82a2 SHA-256: 2cf7313f593e62f462b62d627c5ca6de3ecb4c12363c7479010a339bfd707f40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan attempt. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or redirection scheme to deliver malicious content. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly indicate a malicious intent to trick users into visiting harmful sites.

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://resalured.ru/award?keyword=past+perfect+simple+and+continuous+exercises+pdf PDF link annotation
    • http://tells.fun/vorezokolulapoaq8ps.pdfIn PDF document text
    • http://fijigud.22web.org/que_es_una_sentencia_interlocutoria_en_mexico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_6015b9b2ee535.pdfIn PDF document text
    • http://itclick.pro/133104206779kmq1.pdfIn PDF document text
    • http://kavozama.22web.org/bloodlines_richelle_mead_download_free.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/mojejanpbp88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_6018f082660e9.pdfIn PDF document text
    • http://linza.media/66337531243fvkhs.pdfIn PDF document text
    • http://fitness1.space/christmas_poster_background_freej91qp.pdfIn PDF document text
    • http://cardioactiveitalia.site/66076585880xsini.pdfIn PDF document text
    • http://slamelina.website/xevijufolixidupananilijkfu5c.pdfIn PDF document text
    • http://airbin.top/bewubaguzokatsg651.pdfIn PDF document text
    • http://tedewirivotu.iblogger.org/bahubali_2_movie_hd_tamil_1080p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_5feb005b88e83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450730/normal_6007a41328b16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satonavuka.rf.gd/apple_pages_luggage_tag_template.pdfIn PDF document text
    • http://xamunenefo.rf.gd/battlefield_bad_company_xbox_360_iso.pdfIn PDF document text
    • http://kidatonababo.rf.gd/94052967917.pdfIn PDF document text
    • http://xonefepuvimami.epizy.com/27194504789.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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 5372 bytes
SHA-256: f7541a579fdc8a0539863706fc5fb9100fd2eb0a80bdf48a728690c19e291bc5
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 10132 bytes
SHA-256: ed0bc049a5d3acbfa478e7033e680de7736d8395660704e1897edd591ed596de

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