Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abfe5c3b9b920dd…

MALICIOUS

PDF

69.0 KB Created: 2020-11-18 05:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 74a37196608cbfa3041d7a3460fa4cbf SHA-1: d87a4eddc0d66c23cf2a60d55a6a8293e84aa53d SHA-256: 4abfe5c3b9b920dd66f1c8fce77a7599370f2d9aee717601f774ca375d271e5d
156 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 0.9998

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://trafffi.ru/strik?utm_term=fundamentals+of+electrical+engineering+rizzoni PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5fab667abe039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5f9f940b01503.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/1748675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_5fa4901730ef9.pdfIn PDF document text
    • https://lisubavami.weebly.com/uploads/1/3/4/3/134331762/vojisezogona-bamexevalefun-momutox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fb4641e74627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5fb000a98bcee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_5fadf6648bd97.pdfIn PDF document text
    • https://jamexujibelesuw.weebly.com/uploads/1/3/4/7/134748805/93608759c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5fad3e1b7953f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5f99c1823ccc7.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/73b0fce0-ba30-46d0-a86f-e0779f629f11/18403500707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82feb20-cdc5-4a0d-999a-1e92c12ad711/ruzefopoxuveneralu.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/anoka_ramsey_community_college_transcript.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunoje/tusejajuwukebaremife.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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 5348 bytes
SHA-256: 6ff97ac360b3cf92ce596ff4382e269f149f3510c93ce3d656318b7f6c560bf0
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 10516 bytes
SHA-256: f338d14a427fe8a9d18284dae52226a25e426763ff38c0b9ceb40af38ca80345

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