Malicious PDF — malware analysis report

Static analysis result for SHA-256 fede5b0a5df79231…

MALICIOUS

PDF

62.8 KB Created: 2021-02-19 17:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 44125af80ffc3e1a2a0ad6c0ee88d077 SHA-1: 5f5ff7f5a805164f57251d0f6b1c4cb8a7b55bf9 SHA-256: fede5b0a5df79231360f351fdf9ec6ebb976fe4aa03e86897d761eb16787031f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's 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://leonvi.ru/123?utm_term=macbeth+act+2+quiz+multiple+choice+pdf PDF link annotation
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/rumidi-tukakomiwe-fojut-pefosamomefujen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fed9e078be05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491168/normal_5fccc307a0048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5fdc57f6865f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc98bfcc95e9.pdfIn PDF document text
    • https://sagizebuwajap.weebly.com/uploads/1/3/1/4/131437005/vobasez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fe06a3ae89b1.pdfIn PDF document text
    • https://perepori.weebly.com/uploads/1/3/4/0/134016710/5268555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_602def9ba583e.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/femerodinu.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/kevamivupugujinuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fdecb25eba1b.pdfIn PDF document text
    • http://xakugitanaz.iblogger.org/bangla_alphabet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_6023fd5fd3dc7.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/vafoxi.pdfIn PDF document text
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/2662764.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/bakagogiti_baladiwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowevabi.epizy.com/telugu_movies_tamil_dubbed.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_off0000b8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 5576 bytes
SHA-256: 3a7d28f0186a4d6278efdf5de908e990f1b3b8a6fe03fab1eaa6d28903de4ec1
font_01_sfnt_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 10004 bytes
SHA-256: 30e697f50f8f16f0d73d23e5ff9b39361c5c17d312e7cd1dc3df49bd2151f774

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