Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b87343ce21020a…

MALICIOUS

PDF

72.5 KB Created: 2021-04-07 01:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ab4c2f67d762b4158ba4577ddfd0be2 SHA-1: 0ca0e7afc6b38eaf024ac4b03da59aec3e6473fb SHA-256: 48b87343ce21020a23166e25060476dbfae7143deb17d688104f0d259af6562f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The primary purpose seems to be directing users to these external links, which are likely used for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7486

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 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://pilgrimland.com/sites/default/files/webform/resume-uploads/40494538869.pdf
    • https://www.termis.org/system/files/webform/dexifivoneput.pdf
    • https://www.a1touchsolution.nl/sites/default/files/togivem.pdf
    • https://www.jwico.com/sites/default/files/webform/41164207556.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/nolukaronedibikix.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/buvonajevomowetizebijix.pdf
    • https://ambrose.edu/sites/default/files/webform/28695523124.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/pakajumotarowumomudiro.pdf
    • https://www.mainephilanthropy.org/sites/default/files/guvobirewuge.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/16831560309.pdf
    • https://www.woonsocketri.org/system/temporary/webform/makepepatamizozixijefawop.pdf
    • https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/80982398497.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=starting+a+small+business+in+south+africa+pdf
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e187.bin
931f0121dc0c1c0414bb3cb71200cfec5cdb9e7d250b99b8f6936aedcdd14438
pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 5812 bytes
font_01_sfnt_off0000f516.bin
cb159cc9d714520fdf604515834a8e5d6ccdf81551317d8133b939af7313f940
pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 6068 bytes
font_02_sfnt_off000104c6.bin
3ab7e5b94b7fcabe28040327359d37a81fc98d8f05bb692315ae9ab223aa6768
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10652 bytes