Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e95bd9f72e629d…

MALICIOUS

PDF

34.2 KB Created: 2018-06-11 09:31:01 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: c638d44359f38aeb44b167c60d531fd0 SHA-1: f58116dc5e7fd4018efc031d6dbdc835fea5985a SHA-256: 56e95bd9f72e629d63934e27e7c569303c02e1bbb950d7efde36ba2f75923a2b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded URLs and a heuristic firing for an external URI, suggesting an attempt to redirect the user to a malicious download. The ML classifier also flagged the PDF as malicious. The document body, though partially corrupted, contains references to 'sewer solution' and URLs that appear to be download links, reinforcing the lure. The primary attack pattern involves tricking the user into downloading a file disguised as relevant content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9395

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=sewer-solution.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=sewer-solution.pdfIn PDF document text
    • http://www.doityourselfrv.com/rv-tank-dumping-sewer-solution/In PDF document text
    • https://odorhog.com/sewer-solution-filter-measuring-guide/In PDF document text
    • http://www.balkanplumbing.com/automatic-backwater-valve-solution-stop-sewer-water-flooding/In PDF document text
    • http://www.ezekleensystem.com/In PDF document text
    • http://www.nationalwatercompany.com/In PDF document text
    • http://www.cirossewer.com/In PDF document text
    • http://backwater-valves.com/In PDF document text
    • http://www.balkanplumbing.com/tree-roots-in-sewer-repair-replacement-sewer-line/In PDF document text
    • https://www.denverplumbingconsultants.com/In PDF document text
    • http://www.drainandsewer.co.uk/In PDF document text
    • http://betterconnected.com.au/In PDF document text
    • http://www.draincleaningsolutionsdcs.com/In PDF document text
    • http://www.pawpaw.net/Portals/38/docs/SewerSmells.pdfIn PDF document text
    • http://apexplumbingky.com/In PDF document text
    • http://ivisinc.com/In PDF document text
    • http://www.omahacso.com/resources/faqs/In PDF document text
    • http://mysidewalk.com/In PDF document text
    • http://www.eecusa.com/In PDF document text
    • http://www.millerplumbing.com/In PDF document text
    • http://www.therma-kleen.com/In PDF document text
    • http://pottersplumbing.com/In PDF document text
    • http://haaker.com/In PDF document text
    • http://www.royalbuildingproducts.com/In PDF document text
    • http://uncpbisdegree.com/1/the-hummingbirds-daughter-luis-alberto-urrea.pdfIn PDF document text
    • http://riverside-resort.net/1/wisdom-of-the-crone-a-deck-of-54-wisdom-cards.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sharp-cash-register-xe-a106-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/uniden-answering-system.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-first-battle-operation-starlight-and-the-beginning-of-the-blood-debt-in-vietnamc.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solutions-feedback-control-dynamic-systems-6th-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/year-10-foundation-maths-paper-at-stratton.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-arabic-role-in-medieval-literary-history-a-forgotten-heritage.pdfIn PDF document text
    • http://uncpbisdegree.com/1/summit-ct66bbiadasshv-refrigerators-owners-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-pcv-e308ds-desktops-owners-manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.campingworld.com/rhinoflex-swivel-rv-sewer-kitIn PDF document text
    • https://www.campingworld.com/maintain-your-rv/sewerIn PDF document text
    • https://www.campingworld.com/maintain-your-rv/sewer/sewer-connectionIn PDF document text
    • https://www.campingworld.com/maintain-your-rv/sewer/sewer-connection/sewer-hosesIn PDF document text
    • http://www.frankfort.ky.gov/In PDF document text
    • http://homeguides.sfgate.com/plumbing-snaking-vs-hydro-jetting-87025.htmlIn 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_off00004a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A7D 10580 bytes
SHA-256: fbb67663e748127e47fb794b8c7edf5ea43db1f1e344b344bb711ed30290faa5
font_01_sfnt_off00006c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C01 6524 bytes
SHA-256: b1a43f37039bed7ca80c4f12c615f95b7e071814334f4e7a1d1f94f3b3f3d74d