Malicious PDF — malware analysis report

Static analysis result for SHA-256 326897168533efb2…

MALICIOUS

PDF

76.9 KB Created: 2021-05-21 17:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 08f1a5e3fbb80303a1d012cbc144c23b SHA-1: 90ba7da99567c3a3345de412832326cfb4157315 SHA-256: 326897168533efb2355fda580b289398bdc7fd2e0ee54fddff4853e60ad6cdf3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded content, though heavily obfuscated, suggests an attempt to redirect the user to a malicious URL under the guise of providing software. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://gimoguvi.ru/strik?utm_term=kinemaster+pro+apk+without+watermark+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369519/normal_6056a8bb1a005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_6051208907c27.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/menitapuduboteze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fd6198c405c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_5fd8b04e448b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_60041178847ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_60307f26efc6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_60540de8605d0.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/pebenogupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_605abc9c3403d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406497/normal_6004d3b66362d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426967/normal_6011b657b852d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_5feaf06b97782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_602556aea0db5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_60315a3a1dcd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448558/normal_5feb37ec0cecf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 5476 bytes
SHA-256: e96ed74a5b5b7d69e51c6553d40335332533cbe5a7c4f7508522bfea6ed030e3
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 11120 bytes
SHA-256: f0cb061d7130d3e8adff643f1509e4cfad2da8e388209af9b09344b5e57574fb

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