Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb63764c0355da1c…

MALICIOUS

PDF

72.6 KB Created: 2021-02-21 10:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2a55f110a41d45fa032da1bd4823c17d SHA-1: 7f0ba2b75d0d8f58b2b1ed5317fb09c1f8a47dae SHA-256: cb63764c0355da1c81ae13d69d3483a8962d31be0016d820ab785fc8ccb89923
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily corrupted, suggests a lure related to religious topics, likely to entice clicks. The presence of numerous links on disposable hosting and the ML classifier's high confidence score indicate a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=que+es+resurrecci%25C3%25B3n+en+el+cristianismo In PDF document text
    • https://cdn.sqhk.co/nemuvefik/bicNjcQ/pipodowozasole.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/ggjhhh0/best_meal_night_before_a_soccer_game.pdfIn PDF document text
    • http://lighterusb24.site/ice_hockey_goalie_equipment_cost1u40t.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/moviliniwibinijoba2ys.pdfIn PDF document text
    • http://lefavapexusa.iblogger.org/49251169255.pdfIn PDF document text
    • http://hs-life.ru/51708658991i1q67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_602a1c5bbb3b5.pdfIn PDF document text
    • https://cdn.sqhk.co/kazakilen/IidUjhA/skip_bo_rules_easy.pdfIn PDF document text
    • http://mamontov-net.cc/romiseloxibipogaronq76b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fee01d68fbf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niwewoxupasobu.epizy.com/kumano_kodo_trail_self_guided.pdfIn PDF document text
    • http://zabirozoxut.epizy.com/kagewa.pdfIn PDF document text
    • http://tizavoju.rf.gd/cours_cercle_de_la_forme_saint_lazare.pdfIn PDF document text
    • http://rozofamano.epizy.com/pedetexefikif.pdfIn PDF document text
    • http://zoniguzetixan.epizy.com/lost_maples_foliage_report.pdfIn PDF document text
    • http://devonefon.epizy.com/hinkhoj_dictionary_offline_for_pc.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_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 5140 bytes
SHA-256: 28816323ea16210666dc1a807784e8be34b9ada02608d6ffb5a916227f4f7479
font_01_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 11536 bytes
SHA-256: fa64f04a684140cf1c1cd7c8d4ff6fd709266dfa0d71220d2396ca3be81ddfb2

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