Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a965fc6e352c40…

MALICIOUS

PDF

80.5 KB Created: 2021-04-01 16:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f9d8b74b3a251396ab13b959510b42d5 SHA-1: d00871df65a96cdc5bbdad82db06fa5890773e07 SHA-256: 21a965fc6e352c40e96aa748d2f9fe9dd24626277b87a0afc57f534da8e7f5aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=padi+advanced+open+water+max+depth PDF link annotation
    • http://idealica-ordina.site/jusupazujagaluwb7c8r.pdfIn PDF document text
    • http://numulul.mygamesonline.org/rifumopexuwarivute.pdfIn PDF document text
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/c76290a289ffb.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/fovaxonivos.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/zawid.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/can_narcissists_have_empathy.pdfIn PDF document text
    • https://rubuxunixo.weebly.com/uploads/1/3/4/5/134518382/1718266.pdfIn PDF document text
    • http://normab-id.com/84921311576mbadx.pdfIn PDF document text
    • http://tizezs.xyz/damage_report_format9xdmr.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/how_to_prevent_coastal_erosion_in_louisiana.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/69928200958.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/farunewonopari.pdfIn PDF document text
    • http://meetsucre.pro/11392229744jy2wc.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://depuniwawugupi.epizy.com/inseminasi_buatan_pada_manusia_adalah.pdfIn PDF document text
    • http://newepizudef.atwebpages.com/esl_possessive_adjectives_worksheet.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/cisco_switch_2960_x_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e393476-e23a-4890-9379-8eaca145748e/62872643876.pdfIn PDF document text
    • http://mubadel.epizy.com/canon_7d_eos_utility_software_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d16e20-b827-4d35-9a83-deeeba06ee8e/94993762404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56e8e4e-2e27-4bd2-babb-8f526df01b30/can_we_ask_employees_for_covid_test_results.pdfIn PDF document text
    • http://rawuwad.epizy.com/whatsapp_for_bluestacks_beta_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42f1696-60ef-4ca4-a0f0-19deeb5321c5/how_much_can_a_dodge_2500_diesel_tow.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_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 5112 bytes
SHA-256: f56204e89a0982d55414ee79f2ef294728e064cb4fd475781da92c84607cc791
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 11052 bytes
SHA-256: 10a1bc83817da21bbf0abd31ce69da63bc8b7f268db58d8cb24e98543f1b21a0
font_02_sfnt_off0001262f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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