Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36428535d9d9282…

MALICIOUS

PDF

35.6 KB Created: 2020-10-02 21:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 54bdf57d323a99e326ef79b915b706d5 SHA-1: 242e3f62e644d98897b61f429c7765965fda39ad SHA-256: b36428535d9d9282dc10f33d9bd5090d326ff63571c3c76ee17208128b04d6ee
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=arihant+ssc+stenographer+book+pdf In PDF document text
    • http://zetowe.tebeckillustrations.com/uploads/1/3/1/3/131381540/5962567.pdfIn PDF document text
    • http://xibik.prestigeentries.com/uploads/1/3/1/4/131453249/4226864.pdfIn PDF document text
    • http://xupadar.saludpharmacyshop.com/uploads/1/3/1/3/131383483/e49974a0dd.pdfIn PDF document text
    • http://pijitepa.the8blockfitnessstudio.com/uploads/1/3/1/6/131637021/1196684.pdfIn PDF document text
    • http://files.antoinettemusicministry.com/uploads/1/3/2/7/132711999/099c9aeb2c.pdfIn PDF document text
    • https://site-1036918.mozfiles.com/files/1036918/guronubidaji.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/nenitek.pdfIn PDF document text
    • https://site-1036950.mozfiles.com/files/1036950/97268666444.pdfIn PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/46853750356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9224/9250/files/gadunujekorin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ac7e32-3ff0-4c80-8d25-8db110406440/podonakokopizidil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a4258a-5e60-4192-886c-a456421268f2/baturabodalokoxefirabenat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bafdc15f-22ed-4942-9665-25d8b3abcbd3/35608206869.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_off00004c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C68 5576 bytes
SHA-256: 34b834d8521fb9c06e183ea44e83872dc185931a3a9fb2a59ed95b8ee1359f53
font_01_sfnt_off00005f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 10076 bytes
SHA-256: 8241d435aec627cb5d8d2a0a9960c5bb93705b96c8ebfd6e3c98fed3596c982d

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