Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b504fc044b2193…

MALICIOUS

PDF

74.9 KB Created: 2021-03-22 23:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0b60df13d837523a312f21cef1256fc0 SHA-1: d3f2e3439e48dabd351760aabd3780e8ba1833a3 SHA-256: b5b504fc044b2193227c6d616088f7667414e5e08ad41827508f0d2f1a7d49ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are designed to appear as legitimate documents but lead to potentially malicious sites. The 'PDF_SEO_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=holy+bible+kjv+pdf PDF link annotation
    • http://naturebiolog.space/kigaxugenatolitusuzizozezvugn8.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/wheels_of_life_book_anodea_judith.pdfIn PDF document text
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/565107.pdfIn PDF document text
    • http://stassikorskyi.com/rewonavewufovula7g1rb.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/78cbf0076823f.pdfIn PDF document text
    • https://samoderusewon.weebly.com/uploads/1/3/1/3/131383586/donetabizalobo.pdfIn PDF document text
    • https://kuwovewifinux.weebly.com/uploads/1/3/0/7/130775990/resupazerajaruf.pdfIn PDF document text
    • http://wejnpowk.space/water_bottle_flip_challenge_physicsx7j0z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_4babed7f2220474882a764effa471c96.pdf?index=trueIn PDF document text
    • http://zapusov.atwebpages.com/cambridge_latin_course_book_2_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/cash_advance_form_purpose.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_1641e67257d9491892e28da32d0b60d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegozegi/libertango_sheet_music_cello_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/completing_attendance_allowance_form_online.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/15512453586.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/72083961994.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/what_are_the_dramatic_conventions.pdfIn PDF document text
    • http://solezod.myartsonline.com/48781356674.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/20966591327.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_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 4952 bytes
SHA-256: 5d5e47368c495640704305260c62f8af322e780ad565a4cb4e28daf9a3eac660
font_01_sfnt_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 11208 bytes
SHA-256: 304a5c878192122a7182b95a377d75adc85be096e815109238a50646bd10067d

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