Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45f20890bec46e3…

MALICIOUS

PDF

85.8 KB Created: 2021-04-01 06:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 342938055e8d151cc0fa1aaaaff8e4fa SHA-1: 0fe23a3e65b00ea93af4745763e72454f1ef076c SHA-256: e45f20890bec46e3e53efa5daa6522221ffe68e259e4d10568c7330e1b83afdd
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of a 'download button' heuristic and ML classification strongly suggests malicious intent, likely to trick users into downloading further malware. While no scripts were directly extracted, the PDF structure and external URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/award?keyword=automatismos+industriales+paraninfo+pdf+descargar+gratis PDF link annotation
    • https://cdn.sqhk.co/naxupowu/Nqihxe4/30633145437.pdfIn PDF document text
    • http://spoonnumberone.xyz/kaspersky_antivirus_offline_full_version_free0iu63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5fe390f770909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_605c7108d4197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_6064790e0ec05.pdfIn PDF document text
    • http://antinomi.design/3689700183098qyt.pdfIn PDF document text
    • http://cupe1.ru/vitamin_shoppe_probiotic_gummiescvr8f.pdfIn PDF document text
    • http://fasad-dom.site/tropico_6_xbox_one_controls2uens.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_6046b7f69a766.pdfIn PDF document text
    • http://yourcy.com/gozeka4zs7u.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/4oidFCq/89463046240.pdfIn PDF document text
    • http://luminar3-download.xyz/433874541300y3xi.pdfIn PDF document text
    • http://verification-help.com/the_project_file_in_windows_movie_maker_has_an_extension_.mswmm3r3zp.pdfIn PDF document text
    • http://gravkamen.ru/the_whip_stowe0g5gs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_edefffded87744a199107d0a986849fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/which_rowenta_steamer_is_best.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_ef308b6296474c99bcf22d9ac87814f3.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_4e278fba278f47c49b0afc2ab8ad2075.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/craftsman_lawn_mower_repair_manuals_free.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_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 5464 bytes
SHA-256: 917f5ee1e0e859d2b06cac2a7025a0f5ad6f0dc13190aa4d9b73d0a8c0f4a1b1
font_01_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 12104 bytes
SHA-256: ca0f20bbf391c82c1864e6d735aa9d84ae948d72b7916dd89340dfa34eb92b74

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