Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e7ebb74615ff5a…

MALICIOUS

PDF

79.1 KB Created: 2021-01-11 22:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5559459be90feb9f01c9ea79ceda27f8 SHA-1: 9553a6996359de008f61693292fe1f200e2e31f6 SHA-256: a0e7ebb74615ff5ac05cdb4152bc19faa02f827dcde0a68f5e14e4fc4a8ef399
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs, such as 'https://trafftec.ru/aws?utm_term=vcenter+for+windows+10', suggest a phishing or credential harvesting attempt. The document's structure and numerous links point towards a link farm designed to redirect users to malicious sites.

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/aws?utm_term=vcenter+for+windows+10 PDF link annotation
    • https://site-1178138.mozfiles.com/files/1178138/60386132840.pdfIn PDF document text
    • https://site-1173424.mozfiles.com/files/1173424/19778881187.pdfIn PDF document text
    • https://site-1177660.mozfiles.com/files/1177660/60237572278.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/94128123607.pdfIn PDF document text
    • https://site-1188059.mozfiles.com/files/1188059/vetewa.pdfIn PDF document text
    • https://site-1178588.mozfiles.com/files/1178588/58317947925.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479925/normal_5fc64944f253d.pdfIn PDF document text
    • https://site-1173607.mozfiles.com/files/1173607/1005813895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5fb5c7a4f376d.pdfIn PDF document text
    • https://site-1172238.mozfiles.com/files/1172238/93117295519.pdfIn PDF document text
    • https://site-1175290.mozfiles.com/files/1175290/el_arte_de_la_guerra_sun_tzu_ebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_5fbf4fd511267.pdfIn PDF document text
    • https://site-1172428.mozfiles.com/files/1172428/kagatima.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/kisimujuk/mitugevogidepisowunomupi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/5e_shifter_race.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_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 5024 bytes
SHA-256: 287ad049ff020b914eebafe4550b26fa5fe2ca0d173a68d5e1219fbd30516a0d
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 11488 bytes
SHA-256: 953f5f4773631a6ac43fc51abd6881624b0991486e031fb9f0398cfc6077d105

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