Malicious PDF — malware analysis report

Static analysis result for SHA-256 8312fcbf83f0f68b…

MALICIOUS

PDF

49.7 KB Created: 2018-06-11 09:49:55 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 8de7c01e5e03b036403f9c2eca21fd8a SHA-1: 1c43e27516ef0b26464580a304fbfcd214ec4de8 SHA-256: 8312fcbf83f0f68b5874e6834bdea6af247a23bfacdc5a056bcd020a3eca212d
102 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to domains that host what appears to be an academic packet, likely a lure. The heuristic 'PDF_SEO_FAKE_DOWNLOAD' strongly indicates this is a fake download page designed to trick users into downloading a malicious file. The ML classifier also flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6828

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uncpbisdegree.com/download3.php?q=sponges-cnidarians-and-ctenophores-packet-answers.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=sponges-cnidarians-and-ctenophores-packet-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/download/sponges-and-cnidarians-answer-key-packet.pdfIn PDF document text
    • http://cewede.de/sponges/cnidarians/sponges_cnidarians_and_ctenophores_packet_answers.pdfIn PDF document text
    • http://meinrc.de/sponges/cnidarians/sponges_cnidarians_and_ctenophores_packet_answers.pdfIn PDF document text
    • http://kesama.de/sponges/cnidarians/sponges_cnidarians_and_ctenophores_packet_answers.pdfIn PDF document text
    • http://jeschu.de/sponges/cnidarians/sponges_cnidarians_and_ctenophores_packet_answers.pdfIn PDF document text
    • http://elcash.de/sponges/cnidarians/sponges_cnidarians_and_ctenophores_packet_answers.pdfIn PDF document text
    • http://www.rejaneimoveis.com/reads-online/sponges-cnidarians-and-ctenophores-packet-answers.pdfIn PDF document text
    • http://habmut.de/sponges/cnidarians/sponges_cnidarians_and_ctenophores_packet_answers.pdfIn PDF document text
    • http://habahe.de/sponges/cnidarians/sponges_cnidarians_and_ctenophores_packet_answers.pdfIn PDF document text
    • http://carwashcolorado.net/file/sponges-cnidarians-and-ctenophores-packet-answers.pdfIn PDF document text
    • http://aporad.de/sponges/cnidarians/sponges_cnidarians_and_ctenophores_packet_answers.pdfIn PDF document text
    • http://wixbox.de/modern/biology/modern_biology_sponges_cnidarians_and_ctenophores_answers.pdfIn PDF document text
    • http://riverside-resort.net/1/un-anno-sullaltipiano-emilio-lussu.pdfIn PDF document text
    • http://riverside-resort.net/1/single-blind-review.pdfIn PDF document text
    • http://riverside-resort.net/1/uace-uneb-past-papers.pdfIn PDF document text
    • http://riverside-resort.net/1/the-illustrated-history-of-oxford-university.pdfIn PDF document text
    • http://riverside-resort.net/1/the-runner-christopher-reich.pdfIn PDF document text
    • http://riverside-resort.net/1/spreadsheet-modeling-and-decision-analysis-6th-edition-solution.pdfIn PDF document text
    • http://riverside-resort.net/1/sistemas-expertos.pdfIn PDF document text
    • http://riverside-resort.net/1/the-world-beyond-your-walls-a-manual-for-mobilizing-your-church-in-missions.pdfIn PDF document text
    • http://riverside-resort.net/1/the-world-in-infographics-countries.pdfIn PDF document text
    • http://riverside-resort.net/1/six-flags-great-america-scavenger-hunt-answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7931 13404 bytes
SHA-256: e2f8d8c975706e23112da2dbea795a1b71270a69b7323ef4c2e142506a45845b
font_01_sfnt_off0000a2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A0 8248 bytes
SHA-256: a5329c4f2051898b44e8a0fc1f927bd2a56ce32dca04e48d275e2065d1ea1dd2