Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d32e4affc394db…

MALICIOUS

PDF

29.8 KB Created: 2018-06-11 08:08:07 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 457110d69ad9c603fa8edc9248362424 SHA-1: 55a31e328a33665b059205f8b7d61e03ccc40d71 SHA-256: 87d32e4affc394dbbe5a20b7cd05715f1d589623bb4a2c53d719f57500d74f8a
102 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier and a specific heuristic for being a fake download lure, directing users to a malicious URL. The document body contains the target URL, reinforcing the intent to trick the user into downloading a file. The primary malicious IOC is the download URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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=the-ecology-and-fisheries-of-barak-river-system-of-india-1st-edition.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=the-ecology-and-fisheries-of-barak-river-system-of-india-1st-edition.pdfIn PDF document text
    • http://www.eurasc.org/news/news.aspIn PDF document text
    • http://www.torreyaguardians.org/assisted-migration.htmlIn PDF document text
    • http://www.dermestidae.com/Literat.htmlIn PDF document text
    • http://www.frontierenergy.info/In PDF document text
    • https://www.monnuage.fr/In PDF document text
    • http://www.ideadiez.com/In PDF document text
    • http://uncpbisdegree.com/1/vibrations-and-waves-conceptual-physics-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/treatment-of-human-parasitosis-in-traditional-chinese-medicine.pdfIn PDF document text
    • http://uncpbisdegree.com/1/transaction-solutions-llc.pdfIn PDF document text
    • http://uncpbisdegree.com/1/visiting-card-design-makeup-artist.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-swimming-pool-library-alan-hollinghurst.pdfIn PDF document text
    • http://uncpbisdegree.com/1/toshiba-thrive-users-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/vegetable-growing.pdfIn PDF document text
    • http://uncpbisdegree.com/1/thin-thighs-in-30-days.pdfIn PDF document text
    • http://uncpbisdegree.com/1/without-trace-trevor-joseph-detective-series.pdfIn PDF document text
    • http://uncpbisdegree.com/1/to-make-no-backwards-step-rise-of-the-confederacy-trilogy-book-3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatesofvienna.blogspot.com/In PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=DE_EN&a=http%3a%2f%2fwww.dermestidae.com%2fLiterat.htmlIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=FR_EN&a=https%3a%2f%2fwww.monnuage.fr%2fIn 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_off00003a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A7C 10004 bytes
SHA-256: 0f1b2d4cc96a169c3e83e7d85e14000d1375bcfe447bd67bf1952927f00ef742
font_01_sfnt_off00005a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A48 7356 bytes
SHA-256: 02a7f607fd18637f9137c9b5847595689fbf34da70fce6ccca0246e7fbef1ecd

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