Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfc3c9718c4eb55…

MALICIOUS

PDF

104.6 KB Created: 2020-12-19 12:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0394f219c8865fd8be1cd84b8a180f SHA-1: 36cfde40c95db21c9859df39c1dcbbd59c3c63d8 SHA-256: abfc3c9718c4eb554e70d6185e075ab31e0b9423e573de7b02d4499be58a7499
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, but the presence of 'Avtech dvr manual pdf' suggests a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself is used to host numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8857

Heuristics 4

  • 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
  • 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://trafffi.ru/aws?utm_term=avtech+dvr+manual+pdf
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/b201a50d0a9.pdf
    • https://lewagezu.weebly.com/uploads/1/3/4/3/134369469/7413908.pdf
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/kibenirenal.pdf
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fcf06016e8d0.pdf
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.pdf
    • https://gekitudijelal.weebly.com/uploads/1/3/4/2/134265938/tenefufiparevinej.pdf
    • https://cdn-cms.f-static.net/uploads/4446395/normal_5f9ed99f0ac61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pazifetanegapu/figilivijib.pdf
    • https://uploads.strikinglycdn.com/files/dcc4ff69-0c1f-4e6e-9e56-5e69469817f3/21264256602.pdf
    • https://s3.amazonaws.com/leributafa/girubexeza.pdf
    • https://s3.amazonaws.com/kufazete/73470469090.pdf
    • https://s3.amazonaws.com/kisimujuk/26807564821.pdf
    • https://s3.amazonaws.com/jikopot/subclinical_hyperthyroidism_nice_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/acdcfd1a-a251-4e72-8d7f-aecfcf31facc/bofubi.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016147.bin
953fc1e910484bc4f7a8b359c4d58ef59b64e77149e60221666ada1d6839f069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16147 5268 bytes
font_01_sfnt_off0001730c.bin
fa047c68d3237b12f47051e873fcf62b2c25e9a1614ba8b1c2e92cfaaeb65509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1730C 10644 bytes

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