Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa799a0eb01d03b…

MALICIOUS

PDF

69.1 KB Created: 2021-03-22 12:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4d276f5210466e32233ad6c47b5ebff6 SHA-1: 12d699b215a2e46a688d5b39e14b90e6c98565fa SHA-256: aaa799a0eb01d03b1cdc711289fa96389f597e7efebd38aa885d1cc35f313994
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on a URL hosted on 'kuzutuzo.ru' which is presented as a search result for guitar chords. Heuristic analysis indicates this PDF is part of a link farm on disposable hosting, and ClamAV detection confirms it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it as malicious with high confidence. While no scripts were extracted, the structure and URL usage strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=come+thou+fount+guitar+chords PDF link annotation
    • https://cdn.sqhk.co/bebomopakax/hfogcC9/first_five_prediction_lotto_for_bingo_for_today.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/accelerating_learning_in_active_management_the_alpha_brier_process.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/vakuxawen_sijemakan_xodarixawuketam_xipowupupafara.pdfIn PDF document text
    • https://kanigonule.weebly.com/uploads/1/3/4/0/134017023/vudidut_vatowipaxotari.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/0jjfvEo/monument_valley_3_download.pdfIn PDF document text
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/sumisovotigelok.pdfIn PDF document text
    • http://supesanav.iblogger.org/how_many_subject_tests_does_stanford_require.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/91993263494.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/how_to_make_remote_control_ceiling_fan.pdfIn PDF document text
    • http://rosolab.scienceontheweb.net/9903989909.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/audrey_hepburn_breakfast_at_tiffanys_movie_poster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/mekifuwerenufuramevubuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d622274-dacc-41d0-a1c3-68b62bd8965c/93264524086.pdfIn PDF document text
    • http://gagaresereveku.epizy.com/49766141785.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/how_do_you_say_hello_in_american_sign_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53611e3-51f7-48c8-974f-2d3b642b23ca/what_is_elements_of_design_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7be819-359e-425b-94d4-7a812719b94d/puvajofujenodadibaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/lloyds_bordereau_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7930615a-d90b-473c-a17c-d71967347d30/kupepudugobifufadafed.pdfIn PDF document text
    • http://mopufeva.epizy.com/spinning_wheel_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/62890489292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d1fb0e-9b4b-4cd0-a10d-e2053c36b485/what_is_it_called_when_you_have_no_conscience.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_off0000d241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD241 5308 bytes
SHA-256: d6bd7e86dac81d46ac5628d9ddc5e8fe53c6df61db0c910b61bd06a98ba18015
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 10300 bytes
SHA-256: 45a78e046a90fb61d5db6bcbf60b36f306b9d36786c4789d7d4d099e11de11ed