Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9645a9ee123b68…

MALICIOUS

PDF

63.9 KB Created: 2021-06-05 13:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a811364975f0ca6bf4e37c645a95a2f SHA-1: daf43bc8b366d438db92da0c9d630178c42b179f SHA-256: 7e9645a9ee123b6851946d0a2bd83f6c7ab3663184dc1e692532dfbf78c1654e
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL being https://crysiq.ru/pbw?utm_term=pseudo+clementine+recognitions+pdf. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9818

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://crysiq.ru/pbw?utm_term=pseudo+clementine+recognitions+pdf
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/591158.pdf
    • https://cdn-cms.f-static.net/uploads/4369504/normal_5fd389be3558a.pdf
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/459315.pdf
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fdd0b729b5f3.pdf
    • https://cdn-cms.f-static.net/uploads/4412377/normal_60443ddee105c.pdf
    • https://gozajajemitala.weebly.com/uploads/1/3/4/3/134325553/variloxeva-delekupajevuk-ruwonovesa-visaf.pdf
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/ee13cd22.pdf
    • https://cdn-cms.f-static.net/uploads/4501634/normal_605bde5055dee.pdf
    • https://cdn-cms.f-static.net/uploads/4466661/normal_604b19afac9a5.pdf
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/kunizogiserina.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/953253ba-5fa4-4d3e-a459-55f7331f9c92/121130125.pdf
    • https://uploads.strikinglycdn.com/files/1e143667-de18-4c29-a5e8-3e6a5746cb48/kakurunevimozitujususe.pdf
    • https://uploads.strikinglycdn.com/files/29063532-f88f-4a82-a232-ea7aea530bf3/225757333.pdf
    • http://jutopar.pbworks.com/f/dilunikum.pdf
    • http://zubipuwaf.pbworks.com/w/file/fetch/144510273/how_much_should_i_pay_for_a_husky_puppy.pdf
    • https://uploads.strikinglycdn.com/files/241a7756-3014-4120-898f-6990b51c2199/sidebuzilikogepunubev.pdf
    • https://uploads.strikinglycdn.com/files/0e715845-cb80-4300-b218-91fb39633fab/85287420104.pdf
    • https://uploads.strikinglycdn.com/files/7acc4de9-5737-460e-9389-a4a4681a0de0/96171638806.pdf
    • http://pinurakus.pbworks.com/f/naming_compounds_containing_polyatomic_ions_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/8d81485f-000c-4299-aba2-cd405d8c217a/xuxivovokojilezedupanaf.pdf
    • http://zewalar.pbworks.com/f/46784319507.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee16.bin
c721769786a4a9d03fb8669eb2ec95ce8b6cf898e0678f1274fb7a2324c85408
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 5264 bytes