Malicious PDF — malware analysis report

Static analysis result for SHA-256 2273cecae89bbbdb…

MALICIOUS

PDF

60.4 KB Created: 2020-11-11 18:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f31e15221695fce5457beef875e8a55b SHA-1: daa3d071eb1cd4e0d8e77181e111fa9c505520c9 SHA-256: 2273cecae89bbbdb1ba589549860a1fbaf75257eab16dd74973b0fb04b0ef0fb
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 0.9996

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://traffking.ru/strik?utm_term=nada+dering+bbm PDF link annotation
    • https://tosufiriro.weebly.com/uploads/1/3/4/4/134472590/3685034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_5fa7a0a1ba277.pdfIn PDF document text
    • https://dekekutema.weebly.com/uploads/1/3/4/4/134440935/pujuzutigev_setomorur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5fa09c976865e.pdfIn PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/gupuxilujemefuw-xuduvotuxenoriw.pdfIn PDF document text
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/67d7c5c781b1.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/3291844.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/8c735f35c93529d.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/xedoxonogar.pdfIn PDF document text
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/2635058.pdfIn PDF document text
    • https://watalixajine.weebly.com/uploads/1/3/4/6/134635748/pufesu-gejaruwugesopa.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/boxujetanonikuv/free_pandora_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a34a64e1-bba9-47e5-a784-f9968d4ae905/4317022534.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/gildan_sweatshirts_size_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e777deaa-e6fc-4669-9554-1a749fb05d9e/19676467237.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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 5044 bytes
SHA-256: 1dd5a1e9d8df1fa7607455ca94edf6f947de3a1fea3fd4f63456c95619dcecec
font_01_sfnt_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 10132 bytes
SHA-256: 163c4fe7c81b4b0762f5fc3d15d9ec2876676e323906e4dd17ea3a00d4ee3947