Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebcef8a93e9cfa0…

MALICIOUS

PDF

79.8 KB Created: 2021-05-29 14:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4caf72d92c887975b4f79fc8a61aeb18 SHA-1: da6e183b193bcfa57772d1fc0f356ea6f0732153 SHA-256: cebcef8a93e9cfa0234077d0b553b3a430698d1b3950a9cd93db89c0088e8f1b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on platforms like Weebly and Strikingly. The primary URL, https://kuzutuzo.ru/strik, suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=kimyasal+t%25C3%25BCrler+aras%25C4%25B1+etkile%25C5%259Fim+pdf
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/8497038.pdf
    • https://vifaseberafu.weebly.com/uploads/1/3/0/9/130969816/5600184.pdf
    • https://kijagixizob.weebly.com/uploads/1/3/3/9/133997709/6146000.pdf
    • https://fifubinagate.weebly.com/uploads/1/3/4/8/134854053/sogaleruwezopama.pdf
    • https://cdn-cms.f-static.net/uploads/4457296/normal_6058891d69cbe.pdf
    • https://cdn-cms.f-static.net/uploads/4460232/normal_604a67e2aa72a.pdf
    • https://static.s123-cdn-static.com/uploads/4372719/normal_5fce528c6b803.pdf
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/jinitefulo.pdf
    • https://zuvagenujak.weebly.com/uploads/1/3/4/4/134454716/da5ac66ee0.pdf
    • https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/vevurosuda-roran-bobidozibawa.pdf
    • https://cdn-cms.f-static.net/uploads/4375894/normal_605c036416bc2.pdf
    • https://pasironukid.weebly.com/uploads/1/3/0/8/130814081/fimevonetafod.pdf
    • https://static.s123-cdn-static.com/uploads/4408319/normal_5ff96dada8554.pdf
    • https://cdn-cms.f-static.net/uploads/4489244/normal_603a258b2b1ce.pdf
    • https://cdn-cms.f-static.net/uploads/4370530/normal_6056faa1862f1.pdf
    • https://kemivepume.weebly.com/uploads/1/3/1/4/131407144/3763211.pdf
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/e9115.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9bfbdb6f-fecd-4db3-bd9c-93b061b36338/dorigajasivijod.pdf
    • https://uploads.strikinglycdn.com/files/37b843fe-f7e6-41c1-a1fd-4b9f3fb476f6/partnership_capital_account_format.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f532.bin
a85f137afaeeb1f70a18d5ec8a6678728a5116c182ad89ec6a88d94f8ae13ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 5720 bytes
font_01_sfnt_off000107e7.bin
00f251b9174afcdb0fdb486fe4489bd3c46c44b8aa1391d19be261e68272ca74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 12564 bytes

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