Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7db7ac962c2672d…

MALICIOUS

PDF

71.2 KB Created: 2020-12-21 17:48:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d25dad6e8b9e45e9c00c09356939af13 SHA-1: 8b012bdfacdad0d6d4ea2315e75e3def1c6838bf SHA-256: b7db7ac962c2672da949db673747cf80d611d94b9e8af1cfd092947300e039e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious, likely a phishing attempt disguised as a project execution plan template. It contains multiple external URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=project+execution+plan+template+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f8d9cdee1373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_5fa16cf433f52.pdfIn PDF document text
    • https://fozijiruzixusap.weebly.com/uploads/1/3/4/3/134317533/41c8051.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/bfe871e279.pdfIn PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/1883252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_5fabe07404226.pdfIn PDF document text
    • https://tevuvusit.weebly.com/uploads/1/3/4/3/134373155/1752478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_5fb34d00a73a0.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/9182667c-277b-48d9-ba05-fd96300748fc/56547823112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d835317-addf-4b12-9143-f427c5c5e23b/17416826351.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5dc0a0a2757459b04ecdf/t/5fc77356ad3e641192473e82/1606906714280/eartha_kitt_catwoman_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/borabovakizunaridutazigo.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_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 5360 bytes
SHA-256: aa5a1bac8eaaaea9794e5e6274fc95d608bb60eaa4f1f392c020eb3a2c965402
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10644 bytes
SHA-256: 1c1419e7cd15b6c50d2eb9cbb58a6de543a8fe137c8ae6d2cd745a2a3e3e2ea5

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