Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a99953ddeea42f1…

MALICIOUS

PDF

74.9 KB Created: 2021-05-04 02:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 807ee2eb047832ce20a27a04c757626d SHA-1: 2dc78df87165479338a3de8806e5475a6ac1c0a7 SHA-256: 4a99953ddeea42f1b5a7f87f7b1e17ff63140d66c298485ba321ffe6b9c5e04a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain and utilizing UTM parameters, suggesting a phishing or malware distribution campaign. The PDF structure itself is also flagged as a link farm on disposable hosting, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=d%2526d+mini+paint+set PDF link annotation
    • http://wgathering.org/brandsmart_smart_tv_sale3vx1e.pdfIn PDF document text
    • http://wosozage.mypressonline.com/what_does_weather_symbols_mean.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fed308fc65f9.pdfIn PDF document text
    • http://center-san.ru/what_is_the_meaning_of_the_glass_menagerie9tw66.pdfIn PDF document text
    • https://pujuxapalijened.weebly.com/uploads/1/3/6/0/136009243/wuvowi_sugisop_sogut.pdfIn PDF document text
    • https://xobijetulotifo.weebly.com/uploads/1/3/4/2/134234675/4065867.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/filepef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_60473793a0d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450417/normal_602cef7135cf6.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/sosowesad.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/whats_the_difference_between_dipole_and_hydrogen_bonding.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nipelijikiki.onlinewebshop.net/quran_download.pdfIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/angle_of_repose_table.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_c7f7b815e9884fa989012740364ab917.pdf?index=trueIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/kobezew.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/gugobobadepupomi.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_7a400c9fd2b34607955cfa24d88d5066.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_d1b11ee9d53f4a1a9787dc8b04dd0ede.pdf?index=trueIn 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_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 4156 bytes
SHA-256: d46272a35c141788e45a942f60d3ac75eba256168db5716376ff56f0f84bb3df
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 10784 bytes
SHA-256: a54fa18bf1cd19654770edd3a9a6b316b12033ed6e3b1b6305f3001bd375e438

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