Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ef29cc4165e5d5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-01 06:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7e35a0a167e683b8fe4397bbac7d1fae SHA-1: dbb0b2607784a37c847429b4925d63791ce2fe47 SHA-256: 37ef29cc4165e5d53e9bb98861f1ea1d21213f4bf76b44ef6ea01e5d3540240c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used for SEO farms or to direct users to phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

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/strik?utm_term=dawes+rolls+pdf PDF link annotation
    • http://vekisonoloze.sportsontheweb.net/20354351854.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/wiperevexuvozuvitodeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486353/normal_603190d6551f9.pdfIn PDF document text
    • https://kotuposa.weebly.com/uploads/1/3/1/4/131406283/3d9fc21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383913/normal_5ffa8311d2ba0.pdfIn PDF document text
    • https://nagaxubonafebax.weebly.com/uploads/1/3/1/6/131606673/4418478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475716/normal_601dd3e743ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fd3508071865.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/tinezedu/background_images_love_hd_1080p_free.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/how_much_does_a_1969_shelby_gt500_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/wupazilomifumomiwolupo.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/free_leather_craft_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/live_sports_channels_app_for_android.pdfIn PDF document text
    • http://pugavidugipiton.rf.gd/55777818633.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/6437689876.pdfIn PDF document text
    • http://viromumixemet.rf.gd/google_search_console_generate_report.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_off0000f692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 5128 bytes
SHA-256: 8c276435c8fa7f346692e5b14b08289302fed8daa5b2a1974debd1e1b497ee85
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 10876 bytes
SHA-256: d4e20b13888f64cdf600ae84ee3174d36d5deafe7394dfb4096a39d39bc32a24

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