Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb33cfba0ed84e01…

MALICIOUS

PDF

73.8 KB Created: 2021-02-11 01:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 104990bc57054fcaa8dca7ae8e1210ce SHA-1: 18af15a405e24e97c630dd381e7c652af938cd7b SHA-256: eb33cfba0ed84e019e26800dfe1e566bde8365986e2810fcdf6a40ba9021f677
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The embedded URLs suggest the document is part of a link farm designed to redirect users to potentially malicious content or download further payloads.

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://seumenha.ru/wb?keyword=letter%20b%20craft%20template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5fd7c9e495b86.pdfIn PDF document text
    • http://kogemamumudun.22web.org/82581804963.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5febdf80cdb99.pdfIn PDF document text
    • http://fusubakitakudup.66ghz.com/nojigadaxadikopuwazeven.pdfIn PDF document text
    • http://nawukebakesejid.iblogger.org/8380599673.pdfIn PDF document text
    • http://pibalefiw.22web.org/call_of_duty_1.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/tavejitoj-wunalu-tapawexezaral.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fd7f867f057c.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/1cf962ae1d38b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_600aaed589eab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5ff82d6a99932.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/xakapudakadu/tenesi.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/abbyy_finereader_to_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/1735699477.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/labul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 2996 bytes
SHA-256: 2ae3868186a6baf4e7cbc0bdbebf8578a37ee22aba639da6e24ebbc8fd118e3d
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 5064 bytes
SHA-256: e8b5ebe06621626120969f7a36fbf8388e0cf36bdab731b54e75709c21470ba8
font_02_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 10516 bytes
SHA-256: 898a90c85fe3beb8269c641fde6720c088bfcf13440f35184dce19f7d17d9dca

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