Malicious PDF — malware analysis report

Static analysis result for SHA-256 758b28531056fd25…

MALICIOUS

PDF

35.1 KB Created: 2018-06-11 08:22:54 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 92a36d6d894bccea0de12b9b560ed2db SHA-1: c1d642b6a13006400929f0673e23bf8806354e4a SHA-256: 758b28531056fd25ae5a4296e0fd61b8be89e524338be32e1ae2eae5114970e4
102 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains heuristics indicating it is a fake download lure. The document body and embedded URLs point to a domain designed to trick users into downloading a file, likely malware. The primary malicious URLs identified are http://uncpbisdasdegree.com/download3.php?q=solutions-pre-intermediate-2nd-edition-tests.pdf and http://uncpbisdasdegree.com/download4.php?q=solutions-pre-intermediate-2nd-edition-tests.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9062

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=solutions-pre-intermediate-2nd-edition-tests.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=solutions-pre-intermediate-2nd-edition-tests.pdfIn PDF document text
    • https://www.preskoly.sk/In PDF document text
    • http://www.alleng.ru/english/txb1.htmIn PDF document text
    • http://www.pearson.lv/catalogue/business-and-professional/market-leader-3rd-edition.htmlIn PDF document text
    • http://book5s.com/fce/free-download-performer-first-tutor-teachers-book-new-2015-edition/In PDF document text
    • http://burnscamp.org.uk/2/9/mk2-v6-mondeo-service-manual.pdfIn PDF document text
    • http://www.englishacademy.be/eng-resources.aspIn PDF document text
    • http://englishbooks.cz/13-zjednodusena-cetbaIn PDF document text
    • http://www.englishacademy.be/fr-ressources.aspIn PDF document text
    • http://www.pearson.lv/catalogue/secondary/new-success.htmlIn PDF document text
    • http://www.bg-sex.tv/In PDF document text
    • http://frenglish.ru/english-gds.htmlIn PDF document text
    • http://www.wagner-juergen.de/englisch/In PDF document text
    • http://nashol.com/knigi-po-angliiskomu-yaziku/In PDF document text
    • http://nashol.com/knigi/In PDF document text
    • http://riverside-resort.net/1/untold-story-monica-ali.pdfIn PDF document text
    • http://uncpbisdegree.com/1/smp-interact-for-gcse-mathematics-higher.pdfIn PDF document text
    • http://riverside-resort.net/1/what-are-the-stages-of-cancer.pdfIn PDF document text
    • http://riverside-resort.net/1/urology-practice-management-conference-2017.pdfIn PDF document text
    • http://riverside-resort.net/1/walter-scott-and-modernity-1st-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/unit-test-algebra-2-e2020-answers.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-family-corleone-edward-falco.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-manual-business-research-methods-cooper.pdfIn PDF document text
    • http://uncpbisdegree.com/1/susie-and-me-days.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-british-monarchy-for-dummies-for-dummies-history-biography-a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://es.wikipedia.org/wiki/LibroIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=RU_EN&a=http%3a%2f%2ffrenglish.ru%2fenglish-gds.htmlIn PDF document text
    • https://www.udc.es/bibliotecaIn PDF document text
    • https://books.google.com/In PDF document text
    • https://it.wikipedia.org/wiki/EBookIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=IT_EN&a=https%3a%2f%2fit.wikipedia.org%2fwiki%2fEBookIn PDF document text
    • https://tefltastic.wordpress.com/In PDF document text
    • https://es.wikibooks.org/wiki/PortadaIn 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.wagner-juergen.de%2fenglisch%2fIn PDF document text
    • https://biblioteca.ulpgc.es/In PDF document text
    • http://www.loot.co.za/index/html/index689.htmlIn PDF document text
    • http://www.dictionary.com/e/s/word-of-the-year-list/In PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=RU_EN&a=http%3a%2f%2fnashol.com%2fknigi-po-angliiskomu-yaziku%2fIn PDF document text
    • http://blog.naver.com/PostView.nhn?blogId=singoro88&logNo=120202889652In PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=KO_EN&a=http%3a%2f%2fblog.naver.com%2fPostView.nhn%3fblogId%3dsingoro88%26logNo%3d120202889652In 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_off00004f59.bin
8926b4a4b54b002f482e0d67d892d4832c375353e29a85b97a3c8b73d3b6b5ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F59 9700 bytes
font_01_sfnt_off00006e5c.bin
bd3d6711870a9b5921a5b1af39966f88a7688cb986b4b2cf00c5b04d0d84d288
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5C 6936 bytes