Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a691d86e2c5d17…

MALICIOUS

PDF

168.6 KB Created: 2021-03-18 22:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5ba60b01133a2bfa8c2fa1ce233aa9a4 SHA-1: 178a6fa608f38de350188d525297ed3266878201 SHA-256: 78a691d86e2c5d1732a656cacc4e277aff151dbe1c5919a96a4fe7e5d45d084b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting, suggests a link farm or phishing attempt. While the document body is heavily obfuscated, the embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/award?keyword=math+pdf+grade+10+unit+3 PDF link annotation
    • http://mojofaza.mypressonline.com/75094148351.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zugiwonurubenaz.epizy.com/house_building_plans_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c446734-3111-4742-acdd-97e35af76042/how_to_use_easy_home_sewing_machine.pdfIn PDF document text
    • http://nijetazum.epizy.com/1716182131.pdfIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_131e6cefb67848a39354fe214b165176.pdf?index=trueIn PDF document text
    • http://vorafudozef.rf.gd/79101678943.pdfIn PDF document text
    • http://puvapulugo.onlinewebshop.net/gujarati_barakhadi_in_english_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29bbd78a-8dba-4003-b869-d85ebbbfb29a/81634932821.pdfIn PDF document text
    • http://pomigipasa.epizy.com/fewepad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2b2190-42fc-495e-b507-ed532b86bf90/29988125295.pdfIn PDF document text
    • http://vitipazapabixu.epizy.com/fovufuv.pdfIn PDF document text
    • http://jefebewo.epizy.com/aha_acls_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c181fa6f-5588-4c22-8eee-1f70fb9c23f4/25251889692.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/bill_gates_quotes_information_technology.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_63e724b398c34ac7833c675289fb7b5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9078d58-ecd9-41aa-b3e9-99dc3c750c2f/10899558674.pdfIn PDF document text
    • http://fubegamo.epizy.com/papisevumokufalufe.pdfIn PDF document text
    • http://zedameziwelo.rf.gd/busch_gardens_tampa_map_2020.pdfIn PDF document text
    • http://semewefiji.rf.gd/going_to_worksheets_esl.pdfIn PDF document text
    • http://wukezuzuxu.epizy.com/koxenakifuwixe.pdfIn PDF document text
    • http://pejinubonuxus.epizy.com/46566477752.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2302A 5880 bytes
SHA-256: 5c03e174ac9fb05e126ed2a7a5f76666476ed24973828fe77e8b785b9529e21a
font_01_sfnt_off00024152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24152 5456 bytes
SHA-256: bac165dff3fcd183d980bbf5b313479d2fc857d4dd3db300ebd3823e91d722c9
font_02_sfnt_off000253f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253F5 11876 bytes
SHA-256: 7848c7bb82ef06b35c1b53f67fad20f396d1f8e37a83ecbca89031fc606a1e03
font_03_sfnt_off00027c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27C96 16232 bytes
SHA-256: f54df4aafadc1a1528d683a257ea84fd1246cd35e702780e4edff2a010127ad2