Malicious PDF — malware analysis report

Static analysis result for SHA-256 159204efc3f0c319…

MALICIOUS

PDF

107.1 KB Created: 2021-03-20 01:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0550b872e26c752ba9a44b42bd0658d9 SHA-1: 268fcbe97b1fc8b44e85ef7638554ea2756feb78 SHA-256: 159204efc3f0c3198ad93bb131ebc859b3b693135d06e3dca4e45b481ccc2dcb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of a critical ClamAV detection and a high ML classifier score further indicate malicious intent. While no scripts were extracted, the overall structure and URL patterns point towards a phishing or content-luring attack.

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://ponafet.ru/award?keyword=asymbiotic+technique+of+orchid+seed+germination+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5ffd219044a83.pdfIn PDF document text
    • http://closemaze.com/878635141704t7kp.pdfIn PDF document text
    • http://pc-remont.website/tubegatodilumije85335.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fcdad8edb69b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_6035b0b5d391d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_60371016c8578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5fdcd6a4ed2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_604b98436a658.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/xojafemori/aprendiz_de_brujo_ajedrez.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/36310639055.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/47588378397.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_4e7f9d32cdb6450896a7f0342d743d1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/java_jdk_for_linux_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/wheel_of_fortune_game_online_no.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/axial_scx10_jeep_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/61155497452.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/basic_english_grammar_workbook_betty_azar.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_d65e4a8585414b52aa9264f8ca829c33.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_off00015fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE6 5892 bytes
SHA-256: 140e66ed2157ba7793c576a933aedbe434e686d5a5b4dad2fce39898ad6c082f
font_01_sfnt_off000173ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173CE 13416 bytes
SHA-256: 8345696ea049c34a46fd31955712fe02a8270da29a6c3fd2aea71e88eed9aa4b

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