Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8355d5e95d0f82d…

MALICIOUS

PDF

89.6 KB Created: 2021-04-04 16:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b625471fc0421c95c86daf974e74a56c SHA-1: 69dc89b11ac987229ab7c99e04440c2ca6ef9794 SHA-256: f8355d5e95d0f82db70a8c8ed6a5b8997e0856a4cc5ed30cc57f7a5d9f440d0b
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://nipisod.ru/award?keyword=tumor+carcinoide+de+intestino+delgado.+pdf PDF link annotation
    • https://cdn.sqhk.co/favosejo/ojcY6HF/xunasegiresogisapuwinisud.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/alendronato_bula.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/senudavudikawabe.pdfIn PDF document text
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/visadez.pdfIn PDF document text
    • http://idealica-ordina.site/gokipukaviknnct8.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/zorututukofassqqab.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/d3jathd/papa_pear_saga_como_conseguir_boosters.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/5i1gchi/anchorage_capital_partners_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/NiggjWC/77995623877.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/ece4c685b1f1.pdfIn PDF document text
    • http://chelamela.org/48772200652x0udb.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/nowam.pdfIn PDF document text
    • https://koxofekidoponu.weebly.com/uploads/1/3/3/9/133997415/45b8bb2.pdfIn PDF document text
    • http://safetymirrors.xyz/the_case_against_education7ja54.pdfIn PDF document text
    • http://lugirepapirizo.scienceontheweb.net/rural_area_certificate_rajasthan.pdfIn PDF document text
    • http://deemonatrafik.xyz/4317282348z2x4v.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/doxifuba/research_methods_in_psychology_quizlet_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/trasplante_de_medula_osea_2013.pdfIn PDF document text
    • http://nowageg.onlinewebshop.net/38409555965.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/51473569509.pdfIn PDF document text
    • http://sopavame.onlinewebshop.net/characteristics_of_culture_and_examples.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_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 5456 bytes
SHA-256: b4a9c84cc527b739ade74842f8b44d3e79aa942fcde1ce3bb348438bcd458c6d
font_01_sfnt_off00012ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF3 11936 bytes
SHA-256: 2e28b8284eef6faba0677069dcdea17f4ee4bd1d93c73a8dccfa3e59fde6a904

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