Malicious PDF — malware analysis report

Static analysis result for SHA-256 838d400f501d7f8b…

MALICIOUS

PDF

44.8 KB Created: 2018-06-11 09:43:30 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 2d62641ca0336c8fc243ab3908e211c4 SHA-1: d6785fb79a5ac0ff80e1d94fb21b4c5efe0eba6f SHA-256: 838d400f501d7f8b261b1bf5ee5c135702503ba6a0f3faad9fec1efa56e8b469
102 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier and heuristics indicate it is a fake 'free download' SEO-poisoning document. It contains multiple embedded URLs pointing to potentially malicious download locations, suggesting it is designed to trick users into downloading further malicious content. The document body also contains these URLs, reinforcing the download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9065

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-changing-era-of-e-banking-1st-edition.pdf PDF link annotation
    • http://uncpbisdegree.com/download4.php?q=the-changing-era-of-e-banking-1st-edition.pdfIn PDF document text
    • http://atlasmobl.com/reads-online/the-changing-era-of-e-banking-1st-edition.pdfIn PDF document text
    • http://selenga.tv/reads-online/the-changing-era-of-e-banking-1st-edition.pdfIn PDF document text
    • http://paperipaperi.com/reads-online/the-changing-era-of-e-banking-1st-edition.pdfIn PDF document text
    • http://supertotobet12.com/reads-online/the-changing-era-of-e-banking-1st-edition.pdfIn PDF document text
    • http://vngnet.de/the/changing/the_changing_era_of_e_banking_1st_edition.pdfIn PDF document text
    • http://buffszone.com/the-changing-era-of-e-banking-1st-edition.pdfIn PDF document text
    • http://kaufds.de/the/changing/the_changing_era_of_e_banking_1st_edition.pdfIn PDF document text
    • https://www.testbankteam.com/shop/In PDF document text
    • http://riverside-resort.net/1/understanding-management-8th-edition-test-bank.pdfIn PDF document text
    • http://riverside-resort.net/1/the-hanover-square-affair-captain-lacey-1-ashley-gardner.pdfIn PDF document text
    • http://riverside-resort.net/1/the-houses-of-history-a-critical-reader-in-twentieth-century-history-and-theory-1260619.pdfIn PDF document text
    • http://riverside-resort.net/1/the-problem-with-science.pdfIn PDF document text
    • http://riverside-resort.net/1/toyota-tundra-manual-for-sale.pdfIn PDF document text
    • http://riverside-resort.net/1/social-youth.pdfIn PDF document text
    • http://riverside-resort.net/1/throughput-accounting.pdfIn PDF document text
    • http://riverside-resort.net/1/team-rodent-carl-hiaasen.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-manual-financial-accounting-volume-2-valix.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-of-principles-geotechnical-engineering.pdfIn PDF document text
    • https://www.testbankteam.com/shopIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mises.org/library/history-money-and-banking-united-states-colonial-era-world-war-iiIn PDF document text
    • https://www.investopedia.com/articles/07/banking.aspIn PDF document text
    • https://www.chegg.com/homework-help/textbook-solutions/businessIn PDF document text
    • https://www.history.com/topics/bank-runIn 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://mises.org/library/history-money-and-banking-united-statesIn 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_off000064fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 14492 bytes
SHA-256: 01d4f8428bd42c27048b390055b7401a173a19e3919f5de2752697505826b499
font_01_sfnt_off00009108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9108 8216 bytes
SHA-256: 26857b6a92dd2f3a02bac9efd53c4b3ce6453a7716887531f28cff2ea5452af5