Malicious PDF — malware analysis report

Static analysis result for SHA-256 d383382f5596d53b…

MALICIOUS

PDF

71.2 KB Created: 2020-11-23 13:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2431e5277aaa224082ec456231efaf1f SHA-1: 968f34ed2de269fec005f883463741f8208576de SHA-256: d383382f5596d53b7395f92695fde10df164b83dc2acad9dcfe89abdc54d5952
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=the+renaissance+diet+pdf PDF link annotation
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/sixukejomiwewanage.pdfIn PDF document text
    • https://toxejezewigi.weebly.com/uploads/1/3/4/5/134513259/c6cf9c5348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5f98476021a94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_5fa5c7eec3b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f879b0458a4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f9c34adeff85.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/7348375.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/zosubofovegedoz_vutaxotefumutad_gipexuxapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5f963cef7ddfa.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/f9c04f92d5c8bb.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/37ee3f3f-8d20-4f87-8e4f-427adb43aaeb/bewuwopewezifuwawixiridu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e9fce8-0107-4a18-a9e5-c79858438696/47856857678.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/dls_2019_real_madrid_forma.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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 5160 bytes
SHA-256: d7af6b785113cec1a19f498e788011205d7f640604a127f3fd57dbcbbdeec731
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 10516 bytes
SHA-256: 4257a8176abb4723a9c7e82b5b3550a51b20c23a7277b5178a577629b5acf100