Malicious PDF — malware analysis report

Static analysis result for SHA-256 3905639d84c79a28…

MALICIOUS

PDF

62.5 KB Created: 2021-10-08 20:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9d8daf7b7712dd01d8c2f94c175a613 SHA-1: 545a6666d9a0abe14888713a76e052569d754330 SHA-256: 3905639d84c79a28146927512a193874a1cc6e19d6aa6c2d3de40d1050560c81
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting, forming a link farm. This suggests the primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148a4e21bcd0---26396058112.pdf In PDF document text
    • http://eva.am/files/e3add980b3eea65f.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/basojikisuripasunigajo.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210913000313.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vopixoguvixajebed.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/68555391978.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/kexedamogujiwasakove.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/wokigi.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/vibukerugapud.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/bevexege.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/pugitakesemuxatofobedo.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/66270619959.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/51986824604.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/90840752832.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/zojujowunudafijawadukege.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/59605563261.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/bojabovedo.pdfIn PDF document text
    • http://labotinnghia.com/img/files/misogipulevanefat.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/xufokakujuvimedidupi.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/2245347078.pdfIn PDF document text
    • https://hiroyoung.com/data/files/3219143833.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/95538762650.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/35793164362.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/tokedejikemogubukufobidan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=we+own+the+night+zombies+2PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB632 14628 bytes
SHA-256: f2a3f90ef1b7ff66fca52212eca8157d59fd77719541b27a7af7bbbaaec8611f
font_01_sfnt_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 10648 bytes
SHA-256: 8f1b963b1f911e861df7e460905b2d263e8b497aae4b21b59468ccb295820e8e