Malicious PDF — malware analysis report

Static analysis result for SHA-256 e983507c628be892…

MALICIOUS

PDF

81.1 KB Created: 2021-03-31 21:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8e8dd4bd344edf441e1001830159dbbc SHA-1: 3de4240130f321610e6f7efaf8ffb4daee2fb771 SHA-256: e983507c628be89228ba636b1f65febd66a3bc4f925e19e12a9f2165fc2850af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/strik?utm_term=citizenship+in+the+nation+merit+badge+class PDF link annotation
    • http://scoretdho.best/xiripafarafitukn2qpx.pdfIn PDF document text
    • http://shop-you.xyz/jump_rope_workout_600_caloriesssyql.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/exception_in_java.pdfIn PDF document text
    • http://chunyoo.com/pelicula_de_nito_e_neto_detectives_pmdamm.pdfIn PDF document text
    • http://cz-nitrof.website/ableton_live_serial_number_generator9maya.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/92874066142.pdfIn PDF document text
    • http://omoikiri.info/androides_sonham_com_ovelhas_eltricas_epubo1lnq.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/72198409276.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/what_is_default_ip_address_camera_in_hikvision.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://s3.amazonaws.com/timituvupame/presonus_studiolive_16.0_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d9935b-8846-4a18-add7-811fcdd02b2e/what_is_the_magnitude_of_force_that_the_ground_exerted_on_the_egg.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/kinesiologia_applicata_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/classified_ads_website_wordpress_template.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_ef1282b215514c7194993696be042358.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd19dcc-9f1e-4de6-acfc-84b76769fba4/15414479807.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_612de0fa6142434988796eb91f08288c.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_c7a8799a54014609a7cd3ac3f88faaa4.pdf?index=trueIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_cd386958815e4463829cdee8de5fd888.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/276e9af6-43dc-49a7-8965-cb9e323095c1/sikefobasinadunin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ae7be2-1549-4f29-ae3e-b5e55549f8a6/58422879967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e0e2f3-959c-4fc3-a7c1-fc2a822c019a/graphic_design_portfolio_cover_page_examples.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/bounded_buffer_problem_in_operating_system.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_919b6373613b4453aa94ec9637fda4c8.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_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5488 bytes
SHA-256: 3a5d7dddfe54934a0c33d20602eda1e386afff48a7125aae3ad0a61970582ac7
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 10768 bytes
SHA-256: c6482d86738a4e644ade9517f664b71d9fd3b00955821dea7d37397e5a6291e9
font_02_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34