Malicious PDF — malware analysis report

Static analysis result for SHA-256 12523f11706d0395…

MALICIOUS

PDF

80.7 KB Created: 2021-03-20 00:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 563dbc8bafa68c0350a2375697a76890 SHA-1: 03623d69e2e864842d1519092784f5580ffd8e37 SHA-256: 12523f11706d03950c3ae80c16fccb9a17e4af77defb68580ee3a0762f7950bd
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The document body, though heavily obfuscated, suggests a lure related to programming guides to entice users to click on these links.

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 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://botokaw.ru/strik?utm_term=gtk3+programming+in+c+pdf PDF link annotation
    • http://retys.space/avocent_switchview_100_manualjgdn1.pdfIn PDF document text
    • https://zezujigodet.weebly.com/uploads/1/3/4/0/134012897/badolenukeda.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/7924573.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/apa_reference_style_latest_edition.pdfIn PDF document text
    • https://gotakepe.weebly.com/uploads/1/3/4/7/134763382/6248794.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/79154246862.pdfIn PDF document text
    • http://genusttwsr.fun/dragon_quest_8_ps2_cheatssudfl.pdfIn PDF document text
    • http://mexicotop3.xyz/251026438870m1ku.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/lewuli/56613235403.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_594a30afb3e849b0ac3a1db5b7c14c08.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/administracion_de_empresas_definicion.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_b71fb1328b81449e8aa76fadc2cb59c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/notipe.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/simple_piano_songs_sheet_music_free.pdfIn PDF document text
    • http://boparozib.rf.gd/forced_marriage_romance_novels_urdu.pdfIn PDF document text
    • http://xumomevafuvozup.rf.gd/metaxarularisik.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/quran_e_pak_with_english_translation_free_download.pdfIn PDF document text
    • http://dojorunubi.myartsonline.com/53964099756.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_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 5524 bytes
SHA-256: b28c6f9c225e1499cc720a725fc791cc80c8e2911fcc9965f1c6fec06600d2f8
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 11912 bytes
SHA-256: 4285ca38bb2b9eacda7f2dd7497af30eb94162d235d8874f677a48b3a946ba84

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