Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4cff73d1be3a8…

MALICIOUS

PDF

77.3 KB Created: 2021-03-30 14:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1fa716d74a402e1fb09ec41746c78e91 SHA-1: 4c07e63e2ccfe198c7aff2cef0b22a103398d15e SHA-256: 0ca4cff73d1be3a8e429994fb432f9eb5f20ac59b8defa5a8fba1157da0af220
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This URL is likely intended to lead the user to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious URL within the document body suggests a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/123?utm_term=fashion+design+clothes+templates In PDF document text
    • https://cdn.sqhk.co/xudevekelefe/ttPihjh/43745223160.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/how_many_books_are_there_in_total_in_the_catholic_bible.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/list_of_transnational_social_movements.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/ajcH08R/weboxefesobidid.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/jd3Tjh2/54205605214.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/nURjdk2/chromeleon_6._8_software.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/8TgeEf9/kalidorakupupomoliwuxa.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/41149044165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/the_magicians_season_5_quentin_returns.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/bifilapumatulutelopepuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4aa24a3-c4fa-44c4-a6ee-5dbba6698d1c/79798123628.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/infinity_war_trailer_music_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/serodokedinu.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/passport_renewal_application_form_ds_11_fillable.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/hp_laserjet_pro_400_mfp_m425dn_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5f2204-2214-4a78-8757-226a388047d0/dujebapititagulovubilaz.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/g_a_n_m_ka_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3585b799-b815-4ceb-96f7-462be1cbd258/40202287611.pdfIn PDF document text
    • http://litorow.myartsonline.com/folofogox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0325d8c-0c25-41b9-82c3-b9b059509810/vabonuxemati.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_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 5344 bytes
SHA-256: bea877f9e9c175d36dcf5bb4e9914f5802febfac05d6ce1319808805bc5e56a1
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 10756 bytes
SHA-256: 401e9cd9ca2359009c20538b27734cb8c0132d32bac1f37ebc68967e2b71b3ec

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