Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90a95cd8e851fd5…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 19:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3160dbcbc7f05e7f2654997fb77944dc SHA-1: b56ccb9cc30698bb5bbc0408a60f15da5cb69ea1 SHA-256: d90a95cd8e851fd5ad9cfe3a161f95f7f44343d7ebb080d5f9fc21708cf59469
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=how+to+resolve+conflict+in+healthcare PDF link annotation
    • http://nufemewi.iblogger.org/importance_of_critical_thinking_in_education.pdfIn PDF document text
    • http://tlgfree.xyz/decimals_to_fractions_worksheet_7th_gradee9qo3.pdfIn PDF document text
    • http://trickyturkey.com/zlatan_bolanle_mp4_videoisydi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_600df70b07235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_60482510e1d9f.pdfIn PDF document text
    • http://giftcard-sale.store/practice_worksheet_graphing_quadratic_functions_in_intercept_form_answersktuvt.pdfIn PDF document text
    • http://50offstore.pro/xoluwusufijurovotoxeje5tu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5fef0318779ba.pdfIn PDF document text
    • http://dom-bita.org/knock_knock_endingjrl84.pdfIn PDF document text
    • http://idealslim-ordina.site/rebel_yell_tabl2ol9.pdfIn PDF document text
    • http://migerov.xyz/el_negocio_del_siglo_xxi_robert_kiyosakie189g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412887/normal_5ff2025c6cfa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_60357f3b1baaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_605b06750bb07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f63644-a68b-4fc8-b710-d6a98992a043/tibifibumudokazobuniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5fd5d5-ca0e-4fa7-9c16-7e003de09a81/what_does_tanya_mean_in_hindi.pdfIn PDF document text
    • http://xogobitigo.rf.gd/letow.pdfIn PDF document text
    • http://puguvapalovuzub.rf.gd/80125403954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f3d898-babb-4849-9379-b043aa0c093c/hp_officejet_pro_8600_teardown.pdfIn PDF document text
    • http://rozopujonabesix.epizy.com/27921787999.pdfIn PDF document text
    • http://wuluveviwibe.epizy.com/quote_from_franklin_roosevelt.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_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 5080 bytes
SHA-256: 15742907600e3c48223758a661b39c6c15424fb0ff3fb993038ad13623b91c76
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10196 bytes
SHA-256: a9fc2968a78dc093b61b01d4e7b0402f2c678407c4b8747e2028f56e79db3ee7

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