Malicious PDF — malware analysis report

Static analysis result for SHA-256 181bb3205f13c761…

MALICIOUS

PDF

35.7 KB Created: 2020-04-19 01:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-01-10
MD5: 7ed4b732c09311761d9960d97fac8247 SHA-1: 18b8eb4f959ce21e0a71e4ac58be02f8df79ae22 SHA-256: 181bb3205f13c761800752649594e856c6bdf15510696ec150675e803cf9af33
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://guadaluperegionalwellnesscenter.com/uploads/1/3/1/3/131381802/131381802.html#future+perfect+continuous+exercises+pdf+with+answers PDF link annotation
    • http://lab47.nl/uploads/1/3/0/6/130621841/netufafox.pdfIn PDF document text
    • http://myinsanechaoticlife.com/uploads/1/3/0/2/130272420/5344513.pdfIn PDF document text
    • http://ericraymundo.com/uploads/1/3/0/5/130588710/regutogiwidilenu.pdfIn PDF document text
    • http://enem2022.com/uploads/1/3/0/4/130478347/69bed76b4bef.pdfIn PDF document text
    • http://pioneervalleywritersworkshop.com/uploads/1/3/0/2/130291696/3a338fb51a4e0.pdfIn PDF document text
    • http://driptipvape.net/uploads/1/3/1/3/131383464/8955780.pdfIn PDF document text
    • http://e1venian.com/uploads/1/3/0/5/130551006/7062033.pdfIn PDF document text
    • http://freedomgear.shop/uploads/1/3/0/2/130292110/pobifinap.pdfIn PDF document text
    • http://daniellasnyder.com/uploads/1/3/0/5/130543418/8ff9c7.pdfIn PDF document text
    • http://nocopsychology.com/uploads/1/3/0/6/130605452/e1ebebc5e27caea.pdfIn PDF document text
    • http://christapleasants.com/uploads/1/3/0/6/130640227/sivukilisaza.pdfIn PDF document text
    • http://bcgpay.com/uploads/1/3/0/8/130874157/kopizoduwumifi-wurofu-pasapa.pdfIn PDF document text
    • http://thesaddlersapprentice.com/uploads/1/3/0/7/130740138/8131575.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn extracted file (font_01_sfnt_off000076ac.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_01_sfnt_off000076ac.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5950 7488 bytes
SHA-256: 9f6c691ead2028a7602d3735d7a10554610340299a9f8ce7ac463e714f71a6b6
font_01_sfnt_off000076ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76AC 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d