Malicious PDF — malware analysis report

Static analysis result for SHA-256 745d0e2d636b2f0e…

MALICIOUS

PDF

72.1 KB Created: 2021-02-25 23:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae7d702dacfd1f3e7a3d7cd9df88439b SHA-1: 690dfda4325282870e5c18cbdda6518371b782e3 SHA-256: 745d0e2d636b2f0eebd2f979f91c46e0abd3087a8ad8f80227c3e35374aa95bc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=minnesota+millionaire+raffle+2017+winner`. The document's structure and the presence of numerous links on disposable hosting suggest it is designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=minnesota+millionaire+raffle+2017+winner In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_602f2ed5321c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388406/normal_5fcc3e9be45ee.pdfIn PDF document text
    • https://tatedamemod.weebly.com/uploads/1/3/0/7/130739791/botemufag_vugixujalafuwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_60095f96d9111.pdfIn PDF document text
    • https://nurosamemozixa.weebly.com/uploads/1/3/4/3/134375837/43d502580.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/65140d252d2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_601d781ddcb8e.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/kezapexapoboju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5ff1fc29b157e.pdfIn PDF document text
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/5092992.pdfIn PDF document text
    • https://mapunexi.weebly.com/uploads/1/3/3/9/133999872/lalezuneziweviw-mevud-fonurenodifede-wepabarupadusig.pdfIn PDF document text
    • http://acupofjacob.com/20798523537dnxyc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5ff15f8cb259d.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/belopudevuzuza/jamenuxatozegoko.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/businessman_movie_telugu_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/vuwunalab.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/14905965222.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 5416 bytes
SHA-256: 915d82449ce45bf96dcab9b7f1cce6c3e010de9f048dad6500988e0c7639eeeb
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10436 bytes
SHA-256: af6b8be125daf524255f067c9d92f28841ad3dc17f530d152b7502151821dfd3

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