Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb33a9d3078e28c…

MALICIOUS

PDF

78.0 KB Created: 2021-03-07 20:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 32338f568292fe0026d9320fed9bd7c3 SHA-1: b20a482824b6c8829c4163adbb4f29861bd04004 SHA-256: 6fb33a9d3078e28c70eb0fd0c0c5b6fe8d27d12523c095c79b6841a5d516369f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on cloud storage and other domains. One of these links, 'https://resalured.ru/strik?utm_term=pr+for+dummies+books', appears to be a lure for a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=pr+for+dummies+books PDF link annotation
    • https://cdn.sqhk.co/pimupigedu/ghhfjdZ/66245102155.pdfIn PDF document text
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/9488632.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/MQiifgd/dragon_ball_opening_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/dLURKHF/wixokaropoxogizarotepevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5fdc38a155a4a.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/b1a1390.pdfIn PDF document text
    • https://vedaputenada.weebly.com/uploads/1/3/5/3/135318287/b19a08315bc9bc.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/jinapu_wonuvuzi_ludedutula.pdfIn PDF document text
    • https://kazusabetife.weebly.com/uploads/1/3/5/3/135318045/655151e65de6.pdfIn PDF document text
    • https://ruwivogisi.weebly.com/uploads/1/3/4/2/134265822/4447710.pdfIn PDF document text
    • https://perasukene.weebly.com/uploads/1/3/4/6/134644841/kuzixesezapesopuruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_60142cd865178.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/ciehhXt/portable_soccer_dx_lite_apkpure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446401/normal_5ffeb2cd8be96.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/FmhcIK9/best_berlin_travel_guide_book.pdfIn PDF document text
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/6751345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5ff84bdaa7576.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/rimejiguvif/how_to_view_photos_on_icloud_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/76174292988.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/seattle_goodwill_donation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/gilutitejigebag.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/rotexuxufaxexute.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/76245338786.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/likidawet.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/vekaxeraxadukanoxigosaban.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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 5016 bytes
SHA-256: d9098551948f41e18fb2e18ffeaca921c4ec5db67f3b695002a1cd163f1b933a
font_01_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 13652 bytes
SHA-256: 57430ea67195b18df0d3c9d15e7b7051ea8bf14d30c420e5e4dffd013dc473b5

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