Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8ee68f555da460…

MALICIOUS

PDF

75.9 KB Created: 2021-03-18 00:05:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3d3953d1ef124df289e740808224f76f SHA-1: 2978d2918dfd0b0eac34164c26f2cfcebce5585e SHA-256: af8ee68f555da460a63f2d87515b5079732806a85424364c78838e0a0233cac3
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=is+tai+chi+good+for+vertigo In PDF document text
    • https://cdn.sqhk.co/pibilebomek/iauiaFI/ammi_ammi_mithithu_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488092/normal_6028eff70b865.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/iaUh6Np/35311958782.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/hjjfhfS/57140735253.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/gfhe8dO/uncivilized_definition_in_vietnamese.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404528/normal_5ff4b2eac24ae.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/j8gjggr/fakifipasugatomudexopok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_6038550a38616.pdfIn PDF document text
    • https://cdn.sqhk.co/dokederajo/iijc6Ep/world_war_four_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/Yp0rf9n/12557106846.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/jc4ghgf/43801149060.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/jejbC0y/zutekizikowewuvagavesumi.pdfIn PDF document text
    • https://cdn.sqhk.co/fotinegataso/arPjjOo/electron_configuration_for_oxygen_atomic_number_8.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hgiic7h/clash_of_clans_unlimited_troops_hack_android.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/idiejbR/meberowuwajap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407571/normal_5feb4e3d41955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_9b7333dae44248d0965eeac69fdd151f.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_d55e5c6b79b94967b11e3de6147590a3.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_8d829416d949458d8e235b2886b39a0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/how_to_use_sandisk_ixpand_flash_drive_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/4470566930.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/blackmart_apk_uptodown_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/attach_file_in_excel_spreadsheet.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_0e9ecff8009d4b479b15186828f652bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/200204224.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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 5248 bytes
SHA-256: 47dbb6faf4397741ba2f615217f5c4c7b0ebc2b7889d9756fcfff07b62660824
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 10256 bytes
SHA-256: b2220eacf1ebd7aac3764cfba90e2b37f27848bfd2ff9d3def38704ccbe73cd4

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