Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cc81fb9105102d…

MALICIOUS

PDF

83.8 KB Created: 2021-04-02 18:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2f3fb7733b6e8dfbb085ec6a5c687eab SHA-1: d41938d0a299d6ce354ba32fabf99230608f0e65 SHA-256: b4cc81fb9105102d1ff9726504aa68a089b9fa2981b707172b86208c5049df64
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous external URIs pointing to disposable hosting and utilizing UTM parameters. The ML classifier strongly indicates malicious intent, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lure users to external sites.

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://botokaw.ru/aws?utm_term=how+to+use+waterboss+900 PDF link annotation
    • http://kazotapojiwi.mywebcommunity.org/how_do_i_fix_error_code_11_on_rinnai.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/eucalyptus_camaldulensis_medicinal_uses.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/arrowhead_140rua9z.pdfIn PDF document text
    • http://mivimivisodawo.iblogger.org/keraweruwoxeb.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/why_i_am_not_a_hindu_by_kancha_ilaiah_summaryyptd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_604ce8a963b0e.pdfIn PDF document text
    • http://hs-life.ru/183630312494a2re.pdfIn PDF document text
    • http://topcreditmonitoring.info/tabafadavepabutilapigiubjqh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_605136a2270d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fe6a94a51083.pdfIn PDF document text
    • http://canonsburglake.com/is_there_a_season_4_of_the_crown9algc.pdfIn PDF document text
    • http://leomannapov.com/business_proposal_template_word_doc_free2qht3.pdfIn PDF document text
    • http://business-open.online/31356362436z6oi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_6046701c22ad9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zukuwegafedes.epizy.com/14725269237.pdfIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_1943658153874c56b2059496094a511c.pdf?index=trueIn PDF document text
    • http://dipejigiz.epizy.com/aalayal_thara_venam_lyrics_in_malayalam.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_8db66e7466c44d8fb6dbaf035ca75901.pdf?index=trueIn PDF document text
    • http://rugoxag.rf.gd/mthodologie_de_l_argumentation.pdfIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/exceptionality_definition.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 4868 bytes
SHA-256: c9d30cb9584614cf2470a953cd1031d40e64172fadb270010069d57d3a40f1b9
font_01_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 11316 bytes
SHA-256: 253ebf3a0ba0273ce7de3536fff421589878813738f77a24532fd0ce2067014a
font_02_sfnt_off00013229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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