Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb720e9b0531aa56…

MALICIOUS

PDF

66.1 KB Created: 2020-11-16 12:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 87a2ad9a2f00e4ddbb7b406e16215f1a SHA-1: dd0cf893082d2ea7cce3aa8b420fc4fa66bfbbb6 SHA-256: cb720e9b0531aa568000ca148d7fecb1886f62de8303b4d3f74fd3272d78fbb0
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://traffnew.ru/123?utm_term=what+is+a+character+foil+in+romeo+and+juliet PDF link annotation
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/0e3987b31eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5fa5ee767d1e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f8c1973b7b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5fa57b05b5696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468253/normal_5fb2523aa7b88.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/6eb0f159-90e3-43a2-bec1-c1d0a5df8d71/waluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcee8c66-c481-4dd5-bf17-d5a2ab5608fb/teresomosaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f45fe6-249a-495e-9302-6994508a36a1/57161593408.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/husky_power_washer_gas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80b1b2d-f70e-47f8-bc0a-0f7aec882afe/brett_wolff_md_rancho_mirage.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/81268700970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab0fb19-a635-4dc7-82cb-ae35e62b71c0/zemuvagimaduloluji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bce525d-1ae5-4a2b-985f-f30dd902fbb2/wibugulagazezig.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/78507806585.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_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 5352 bytes
SHA-256: eb7f1d45eac6b63e108f79918a1d6afe33b518c354acaacf342bad446f663f84
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 9976 bytes
SHA-256: 592dd975e83749326b0036f3fef63db501988aa3b7be879ac17a0989a78c47b4

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