Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cb845e9fcd1936…

MALICIOUS

PDF

89.2 KB Created: 2021-03-05 09:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 693d0a9664224e2a747e1069d2784913 SHA-1: e0cd896eb98a94eac35ce941cf1086ad06db3e02 SHA-256: 18cb845e9fcd193645a75a580ac9a85768aff585ff598542c0a634cd6667d726
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a link farm on disposable hosting. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of numerous links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/wix?keyword=circle+line+design+worksheet PDF link annotation
    • https://cdn.sqhk.co/nobipajami/hghjfgh/88290813805.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/ePhaihD/tebewofepofelonogedataxu.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/kavef.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/b40469d252a.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/djbJlcj/download_factory_inc_mod_apk_unlimited_gems.pdfIn PDF document text
    • http://gofimowekes.66ghz.com/jdk_8_for_linux_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/hdKoTLj/30873709091.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_ddf62194332a41bdb62361d3cab6481f.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_f181dd8126774c8ca5ef8c0c796926fc.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_d20a708a477943f2b79130f3e4aa6419.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_01ee6f9e495643879a2cc56cbd4c7529.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/exam_master_free.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_6d79b5ddd07f45349435ad1f3dcfbf78.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_c885e641143f4a60957b342af1dde97d.pdf?index=trueIn PDF document text
    • http://jojudodadanu.epizy.com/big_wild_thought_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/tobopunopefowut.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/lodezorowalum.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_08e420af6cff4e4ead813dc745dfd484.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/xigogugusuw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 5052 bytes
SHA-256: f1dd429fae110f1403ea85bd0adda90e2f74dc00480077df79b285d3f19eac0a
font_01_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 11080 bytes
SHA-256: d2cd97b2a7b72a1cebbb4d63db35da78ccf054e7f354834089d577eed04d8fb7
font_02_sfnt_off000141d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D6 16156 bytes
SHA-256: 1c35358e934a8c4c2b8c52c85a615dc57553e58944af0a7af039c24cdecf7ea0

Open this report in the interactive analyzer, or submit your own file for analysis.