Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33e3cbe3db99285…

MALICIOUS

PDF

63.8 KB Created: 2020-11-10 16:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da8637f880d9225ed2843dabd2eb3bf1 SHA-1: 214c700cac2463454061e5f33e289b532b5633e9 SHA-256: b33e3cbe3db992854bcb91a1b25363b7c0f5ed42bafcc7ecf8352969f31bf664
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/strik?keyword=dnd+commoner+stat+block PDF link annotation
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/bofawuferexuku-tokaz-gikozi.pdfIn PDF document text
    • https://gozuvixonoj.weebly.com/uploads/1/3/4/5/134517501/sotemekedakalogoma.pdfIn PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/6125810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1b23e4-1172-49d0-a7a9-b547fefd2769/atlas_de_anatomia_gratis_para_baixar.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/middle_school_journalism_class.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/infosys_aptitude_test_papers_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc000e3-7c41-4c6e-8f44-dff23d360302/fabomeniwamadarij.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/genki_workbook_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b4ed33d-2427-4981-9972-cc67e4d9c50c/86051128519.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/vocabulary_for_ielts_academic_writing_task_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/celebrate_recovery_resources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22526e52-d6e3-4f9c-8829-37a7f3af4f34/southern_colonies_relationship_with_natives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3cafbb-d605-4428-bfc2-4c7a66b2094a/smi_mass_production_tool_sm3267ae.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_off0000bb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB55 5288 bytes
SHA-256: 112d38656c5cfda497434dd0f88cdb690bd9e4a52599869b575d898a88110291
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 10928 bytes
SHA-256: 572adb168229fa74872dbd441e69904e703fecc66ba89d2493d1c949d812e120

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