Malicious PDF — malware analysis report

Static analysis result for SHA-256 4382fce0f144f055…

MALICIOUS

PDF

66.3 KB Created: 2020-11-13 01:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3b54464d9f33a6d90e4acb4a8a6d6f64 SHA-1: 98c4634b88ad293c5eae82398aeef60c6878a103 SHA-256: 4382fce0f144f055a697299ecdc3921aae2003bdf661e8abc56ee903f410e898
156 Risk Score

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://trafftec.ru/strik?utm_term=ati+radeon+x600 PDF link annotation
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/gofusodi.pdfIn PDF document text
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/pawupagapuruxibut.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/letuwuzutizobiw.pdfIn PDF document text
    • https://kisigitoteke.weebly.com/uploads/1/3/3/9/133997396/gejexidotim-sulotug-pezelidulawaza.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/20fafc66-645b-4e80-91ac-b39a98cbe73e/hd_1080p_vehicle_dvr_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/fekesenoweketi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5418f0-2e06-4abe-b2ca-5bca9d84ff52/7006696492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07091162-f19c-411b-8032-e597f5b47baa/7201480021.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/43891218514.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/the_grand_strategy_of_the_byzantine_empire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c38808-ecda-42f2-819d-b89e90628638/words_of_imagery.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_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 4964 bytes
SHA-256: faac0c14e53c699fb0fb9e6e5ded8ccb8a2481b92053a53ff5d5ad3d18e74958
font_01_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 10780 bytes
SHA-256: 6397f4322301407687a0e246db1482c985c28c2c7bf2cc6557ac9a11c148c302