Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a655bb5c3c46df0…

MALICIOUS

PDF

74.6 KB Created: 2021-05-16 02:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8ec5b554b3b328f1e015d0efabd96d03 SHA-1: 521604491d2d861d948754fa421e71411f89ea92 SHA-256: 9a655bb5c3c46df02c18e4e3f6dbd45a3724b12b3e79df21c3b8e8921cff2c0a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=ejercicios+operaciones+con+notacion+cientifica+pdf PDF link annotation
    • http://wofonefa.iblogger.org/99663007818.pdfIn PDF document text
    • http://rojemop.iblogger.org/ubuntu_14._04_64_bit_iso_image.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2e8a38710.pdfIn PDF document text
    • http://tuwosip.iblogger.org/my_autobiography_worksheet.pdfIn PDF document text
    • http://goxezidoge.22web.org/padevof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_605826aed1468.pdfIn PDF document text
    • http://bobizumi.22web.org/10_freeway_traffic_report_redlands.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_606e8d49cb59b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_60637189f2c25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://movewexa.rf.gd/65602944592.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/navy_sailors_creed_audio.pdfIn PDF document text
    • http://delenujafoxa.rf.gd/ashampoo_free_review.pdfIn PDF document text
    • http://tatifamajerub.epizy.com/a_pair_of_tickets_amy_tan_citation.pdfIn PDF document text
    • http://sajutab.rf.gd/approach_to_chest_pain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7757451-ae1f-4005-b4c7-b774035a1cf2/64932157288.pdfIn PDF document text
    • http://guxenubegipus.epizy.com/bharathi_kannamma_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/docker_kubernetes_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/resume_executive_summary_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446e0d96-f089-4dab-82a7-4f320568d290/sintomas_de_trombosis_en_pierna.pdfIn PDF document text
    • http://bevevekafoli.epizy.com/ecb_target2_guideline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed387db1-16f8-4370-92b9-147b367f445f/bulova_precisionist_x_limited_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/damomijatowobubapuz.pdfIn PDF document text
    • http://golukotekitu.epizy.com/vizio_v2_sound_bar_remote_code.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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 5152 bytes
SHA-256: 92fb0cfc072aaf63a8730846254d228507e6509eaa65bd6ddf3af4a63b10985c
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 11876 bytes
SHA-256: c53bf6ec285c919429b9ecc4e1c021bf19ccc04745640cc56d5055724efaf6ca

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