Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07c4ce486d13ef7…

MALICIOUS

PDF

76.8 KB Created: 2021-03-11 13:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f68f3d28050dec6b58dbf7ea5bfb6e19 SHA-1: 9aa5be85ba93f313cab3f0ad96aaf0d56e4d4882 SHA-256: e07c4ce486d13ef7e38055c360e54018c9654157cf23716000ee70785a72ae75
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirect to known malicious infrastructure. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting an attempt to manipulate search engine results or phish users. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=web+designing+course+online+free+in+english+pdf In PDF document text
    • http://salestore.pro/6365281901263tts.pdfIn PDF document text
    • http://theharaka.online/30203859853bdy81.pdfIn PDF document text
    • http://boketizabujig.scienceontheweb.net/33242316592.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/cardiopatias_congenitas_cianoticas_e_acianoticas.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/18357584618.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/xudavaxujalukom.pdfIn PDF document text
    • http://vilopeg.xyz/design_sprint_2._0hu070.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/25dba317-5700-4790-bb3a-e33f527ccbed/unequal_childhoods_class_race_and_family_life_annette_lareau.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_058bc75060ba4179a269e0e25cc89c1d.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_f0f5b3d7d2984e64a5ee8d0779f682b2.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_7aa643587fcd41909be821d413eab6ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67f2d24-b38d-437d-bf63-7f83b4fb3d8a/58815700609.pdfIn PDF document text
    • http://vosojeki.epizy.com/75337125819.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_9c8c921a326b43e79061def7384358ea.pdf?index=trueIn PDF document text
    • http://xagewojijakeri.rf.gd/arnold_chiari_malformation_nhs.pdfIn PDF document text
    • http://jonesojawu.myartsonline.com/x_and_y_axis_graph_paper.pdfIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_25d43c20e0a4452eba66a595cf1b80bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e9a0b5-f4e1-4730-b732-aa30e18936fb/walt_whitmans_poem_i_hear_america_singing_analysis.pdfIn PDF document text
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_298e855f87c74a6f97f42c0669e4ca2b.pdf?index=trueIn PDF document text
    • http://luxorofanogefa.rf.gd/bajefeguwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c0a088-c3c8-4010-a825-e3c2ce3fa7ba/windows_movie_maker_project_file_extension.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_d83b3a024b1a449b8e37789bfa39b5f3.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_de63852afdbb46649457affb305f9884.pdf?index=trueIn 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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 5360 bytes
SHA-256: 4aa0bb9a4eaadb3ce420b2d0caca7c5c05e39dd568741e49d38fa72947a6d5f4
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10396 bytes
SHA-256: 08b5c3bf396682d7a59d72736be10a8e4662e086a21c4f5e600b7b4388b11905