Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9324c7c298d6134…

MALICIOUS

PDF

87.5 KB Created: 2021-02-16 01:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e7a737020399adf2a35877807ce997fe SHA-1: b7307922c3947101ca9abd1d9105d7aae73c1914 SHA-256: c9324c7c298d6134a955f072e5013e9c9897402325cd259d875f2525f9d61f31
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=what+are+the+7+gifts+of+the+holy+spirit+with+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409258/normal_5fdacca75b4fc.pdfIn PDF document text
    • http://freshka.fun/memidikolijonoretopalumerdohe.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/bc86989d0447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415964/normal_5ff49791eb77c.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/561b6e28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379030/normal_5fee480d69728.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/6295450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480161/normal_60259b224d459.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/saludos_y_despedidas_worksheet_answer_keyhwf7i.pdfIn PDF document text
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/85bf8aa2.pdfIn PDF document text
    • http://fly-drive.online/16550993602xi6qt.pdfIn PDF document text
    • http://topcreditcheck.info/amma_songs_in_telugu1nu1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_60101172bfd90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fc859bacc161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408989/normal_6005217ac080a.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/gimisorixosu/63159669822.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/physical_science_textbook_grade_9.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/motivazioni_sentenza_cassazione_bossetti.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/microsoft_word_mcq_questions_and_answers.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_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 5604 bytes
SHA-256: 462d8ea3cdd02f4badf7a939688519834519b14547dd30faa3f9348a18ce845d
font_01_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 16380 bytes
SHA-256: 6122b3dfce07f17a7fec90468f2f42e6dc05b92a440c2401e82a285eea11bde0

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