Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ad2f7803914a7a…

MALICIOUS

PDF

77.1 KB Created: 2021-06-01 03:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 23ca9abb395b58a35c81516420869866 SHA-1: 8aebb6747bdff810c50234aad88df43f8c99f629 SHA-256: 73ad2f7803914a7a4a10c2d9e8d5805d816aa2a3758b4269c07fccc2d3173f07
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one primary URL that appears to be a redirector for a 'Free Fire Max APK' download. This suggests a link farm or phishing lure designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://infrive.ru/pbw?utm_term=free+fire+max+apk+descargar+2020+para+pc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5fc6f2daec658.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5fceac392f36c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393359/normal_5fe34b5ec9612.pdfIn PDF document text
    • https://wuxipatinux.weebly.com/uploads/1/3/4/6/134662372/5251952.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/regexuteza_sederamijexu_xenixo_pimuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_605b8a7e59dc4.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/c3e1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_6040a93ed1f34.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/598ac08d-f802-4270-82d8-7fd9b54cfcb0/18257322482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5cf1da-e14c-4e6d-8055-01e52583d992/how_to_write_a_professional_resume_summary.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/11525276101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71c33218-1fde-4a78-bc5e-b28c517b5b22/jurilodupotonisowu.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/incident_reporting_accident_reporting_procedure_flow_chart.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/gasuniziriju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a45cb9f-61ec-4b26-9e80-0cf99aa899f2/94408059889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4c1df8-9b0b-4ac6-a216-079c26e3832f/bancolombia_colombianos_en_el_exterior_espaa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522d133d-6bd6-4af9-be96-7668ff6dec3b/rareli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af841a9-43ba-4e54-b79c-86db474a575d/hp_35s_owners_manual.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144437886/71864706044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4461ca-6856-4e02-9c23-ab96b8dd7632/vezibagazupularafosorelu.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144426936/true_devotion_to_mary_with_preparation_for_total_consecration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10870230-fa2b-4cc6-8cd4-c33211ac228e/14402344399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/441def41-c762-488a-a369-6eff6c5de908/how_to_write_a_letter_of_mitigating_circumstances.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c888e133-bf5f-4ff7-a505-66521d7019e3/7311651349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a8b646-cc61-4294-ba6a-428627698d08/vex_2_hacked_unblocked_games_66.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8964167f-15e6-41e0-9a7b-528e8b7d36ce/yugioh_duel_links_buster_blader_deck_list.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_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 5804 bytes
SHA-256: 9ba1fad02d0a0715113f8f41628385a135514053182c30d5330e1ae020765094
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 10552 bytes
SHA-256: 314b39cc050879762128bcf798625d2214205f66f002ccef6d29ed8be5391ce6

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