Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf0aadc21a544f5…

MALICIOUS

PDF

70.5 KB Created: 2020-11-20 10:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2cb18cc8eab976cafdacc54a59e11144 SHA-1: dc3be7e4145a24da85a92dcd1b5f48d7e448f536 SHA-256: dbf0aadc21a544f52fd510767f8446d1cfeaf252dfffb2d0b8ac0369d8eb9c3a
186 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 0.9997

Heuristics 6

  • 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.
  • 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://trafffi.ru/strik?utm_term=fed+up+movie+guide PDF link annotation
    • https://ridivuxizoram.weebly.com/uploads/1/3/4/6/134633738/98731a26eb996d1.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/5de8b811.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/gemedowenag-wegudexurasu-tawokegir-bopunarusiwoxok.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/wajavibinudepefob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f8f6b2dab0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5f9204a874997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/23893f1b-5d0a-41d3-8c71-bece14913a12/gubexovevejuviwole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc73c9a-7cbf-4d58-80f5-bff4e41e800f/posulanewavumodaduwuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6cef364-c26e-4972-b25f-9c6ded9e16f0/30438774640.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/2525748059.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 4476 bytes
SHA-256: 510bc805338df01d0d4bb597287b5fef1487d80b126f19e54fd0f27e4d257659
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 10668 bytes
SHA-256: a9ac106524d8121bcf54107d8129b735fabd8feacd9f2ae71716a2997c056883
font_02_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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