Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b0b7c6414a6ffb…

MALICIOUS

PDF

107.5 KB Created: 2021-02-11 23:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83a77e814bea1444bec248e2b5d1adfb SHA-1: da09ae573c03f1ae4008c5faaff9f35258196846 SHA-256: 49b0b7c6414a6ffb627d9c50c8f3bf42d1d4d6c9429f6b8f664f0ff493dee17a
66 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=phylum%20arthropoda%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453909/normal_5fe2b06eb0c2b.pdfIn PDF document text
    • http://maxist.ru/riberiboja1zy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5fdc7cb17f66c.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/hhe9Kij/niliwiripesamaporifobuder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fc61093c32bc.pdfIn PDF document text
    • https://cdn.sqhk.co/wexapitode/BUgilR8/9999223717.pdfIn PDF document text
    • http://pitushok.space/235689727262t87a.pdfIn PDF document text
    • http://pet-guru.shop/23250582207u1ow6.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/ggejifw/among_us_game_ps4_cost.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/xeluxumujuxeviney4eqq.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/8gcPjdn/88454043428.pdfIn PDF document text
    • https://cdn.sqhk.co/fofubulami/7UJjcBX/uncivil_agreement_sparknotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484835/normal_5fe8088009b29.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/gI1hiaa/torapesilamukowozelunital.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/paropabaru/alexander_publications_distribution_transformer_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/android_cardview_example.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/67145176855.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001597d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597D 3016 bytes
SHA-256: 58d72bf77caf06f196ded4b34c89bed61a9c4a6ede306bb0efd38173e7a75772
font_01_sfnt_off00016435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16435 5204 bytes
SHA-256: 71fb44db9e59d8d7e3f6af4c1b181f9dfa8721e2da63246fd2c5bdf615ad9850
font_02_sfnt_off000175c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C4 12780 bytes
SHA-256: 71b2fcfbde34178e262321635d33f3644b775a06e4cfb0ff10a358ff84766409

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