Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbee08469a01c6b…

MALICIOUS

PDF

75.6 KB Created: 2021-02-14 00:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf7cb0ecb7a532f0cbc8669f4fa263f0 SHA-1: b8de1b27ab2a0aaa829c6d744324475e84b5b6fe SHA-256: 8dbee08469a01c6b2b4301c932e25306c00a194737df3c6b322d83086d6fcc5b
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://maypoin.ru/wix?keyword=lompoc+school+district+transportation PDF link annotation
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/aa357795376e465.pdfIn PDF document text
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/b10f78.pdfIn PDF document text
    • https://jojiwunu.weebly.com/uploads/1/3/5/3/135387754/5424532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419629/normal_600f1b122079c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_5fda553d2ed42.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/fibesezati/vpn_android_china_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/juzasemexukar.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/background_image_black_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/dovowivumizeriwusiripa.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/necesidades_biopsicosociales_del_ser_humano.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/guwalojigipoluterugife.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/molecular_models_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/marvel_spider_man_ps4_free.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_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 5252 bytes
SHA-256: f254302faedd93bdf5f12eebbdba32141bbacae11df3f229ab9c77cea5aeae8f
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 9880 bytes
SHA-256: 2f9bce65b959c83e00753e8e62794fe9d6f2ca80c0f8f322a9c469f6c9a0a1a3

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