Malicious PDF — malware analysis report

Static analysis result for SHA-256 3398964f1deee993…

MALICIOUS

PDF

72.9 KB Created: 2021-03-03 13:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b810bfbaa5d1408251a61b973e5c567 SHA-1: 18c67e25067d28d74c1f8e41460e2a6b9fc87fe1 SHA-256: 3398964f1deee993f9744bb1265324c2172f792b39b49b5cd10a71e59857881e
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 critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards a phishing or malware distribution attempt.

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
  • 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://zajinet.ru/wix?keyword=dover+marching+tornadoes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fea01e8894a6.pdfIn PDF document text
    • https://takupomowemeb.weebly.com/uploads/1/3/5/3/135314116/9f1f6ef22200.pdfIn PDF document text
    • https://wanujonoguj.weebly.com/uploads/1/3/1/6/131607110/pobogu_fedunuzijuzodaf_xoxot_migup.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/17132839568.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/9979449.pdfIn PDF document text
    • https://tikivumisa.weebly.com/uploads/1/3/5/3/135346314/b89c930f6cc.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/mla_worksheet_practice_works_cited_entries_answers.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/cbse_6th_class_maths_textbook_solutions_in_hindi.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/pc_das_english_grammar_book_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/95748162769.pdfIn PDF document text
    • http://xotepugiz.rf.gd/interior_design_courses_in_mumbai_government.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/converting_cm_to_m_worksheet_ks2.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/kerupuk_ampas_tahu.pdfIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/verizon_fios_quantum_gateway_router_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/spelling_words_for_3rd_grade.pdfIn PDF document text
    • http://kawojimulogizef.rf.gd/87561178901.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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 5380 bytes
SHA-256: 0ff2437f30dc95442f85a2cda2f6f91053e6bf52a2e6c8abff63e72ce285abbf
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 10340 bytes
SHA-256: 15974bcce66a3bf863c85a9bf3caece39e33d68bedf2463d7f4e76f9585ddc15

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