Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9825e4fd9b7018…

MALICIOUS

PDF

77.7 KB Created: 2021-04-06 05:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47822b040f3887e00c7da089cf8dab33 SHA-1: 20e99e610af488f9c1d07149cf3c668516feca79 SHA-256: db9825e4fd9b701872f0af6acf18fcc729028b855598864474352ef47a648a7c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content, possibly as a phishing lure or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://resalured.ru/award?keyword=applied+behavior+analysis+for+teachers+8th+edition+pdf+free PDF link annotation
    • https://cdn.sqhk.co/gixejefi/cNhjiea/7173103628.pdfIn PDF document text
    • http://pirojibanenuzi.getenjoyment.net/63876757720.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/other_people_s_houses_abbi_waxman.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/jsjfLib/gotujipezovulinosedab.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/acetilcistena_xarope_bula.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/cuhb7jj/33031194435.pdfIn PDF document text
    • https://cdn.sqhk.co/fakosopalo/Cggjb7w/best_voice_chat_pc_games.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/can_you_refill_nespresso_pods.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/difference_between_active_and_passive_sensors.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/positive_spirit_body_mind_and_soul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/122fcf0f-3715-4c65-85c7-756dc1cca409/como_falar_bem_em_publico_youtube.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_54bf9e664af047f6a1eca7f13b5d35d6.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_2b8cd919d58b45dba0df5f0eb80e5ce7.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_c3ccf59de0c44357a79f504b6a441848.pdf?index=trueIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_15e66011c5e94b6e9f25655caebb31a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c139f1f-d637-45b5-ade7-51048bbf30f0/nobody_mean_more_to_me_than_you_and_the_future_life_of_willie_jordan.pdfIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_a3b2b5e0c405428abdc9bad7524a8c48.pdf?index=trueIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_5587c4fbde3d4308bc8d6e1626944575.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58ff156-efd1-485f-b900-e186f477c56a/cuales_son_los_principales_problemas_de_salud_publica_en_mexico.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/technical_interview_questions_and_answers_on_data_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ffb84e-eb83-441a-87f1-9bd44f7399d9/how_to_find_an_open_aa_meeting.pdfIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_6f08d295f4c14bcbae4f1e05123e07aa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 5516 bytes
SHA-256: 7de90fb5d5e6c194eecc2e4bdc7013b010e99c258e35d22f19f566900f380bc8
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10924 bytes
SHA-256: 9f1a43e0a1aa2ff3c5df65e3070adfe177236ceea97fe268387f610f74aaf6d2
font_02_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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