Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76761b3d1cf1808…

MALICIOUS

PDF

74.8 KB Created: 2021-06-11 09:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 84ce6639712ce82299c23de884d37935 SHA-1: bdbc0c4d55f3e1fb57c91f628b713defb6e4efa0 SHA-256: f76761b3d1cf1808c867e50b6c4726f298421f7867a17a556baaba0c28ed412c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs likely lead to further malicious content or phishing pages, aiming to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8924

Heuristics 4

  • 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
  • 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://inwebjor.ru/pbw?utm_term=nullification+crisis+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452609/normal_6003266786f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_6037ff58346a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_60563798e42b8.pdfIn PDF document text
    • https://daxuwolazu.weebly.com/uploads/1/3/4/3/134335064/jimebudexezosamave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_60616b7a658aa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381318/normal_60b4b87523608.pdfIn PDF document text
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/600955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490523/normal_5ff65f3ca89b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_603995b5a2294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_60538d30638a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5ff52d1a34b57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_602e1d19b4902.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381971/normal_60b01542a123a.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/e4ef1a6b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_60503bba94e94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5fdfa960a0cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_604d17021c948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 5092 bytes
SHA-256: 6d74f64d5c02bc849d2dba83074c7b994334c6d235b6a988c0de5fc2342d5088

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