Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f7b58e14de5f74…

MALICIOUS

PDF

40.8 KB Created: 2020-09-30 22:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 450e98bab818a52e7fa245a81e01a312 SHA-1: 2c134b88d4fb995436316aca74a2d8f2063b31e6 SHA-256: 21f7b58e14de5f74dd37312401813c7dca408d0614ca3a20ef47f37e8dc08db7
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://cctraff.ru/strik?keyword=zahlenstrahl+br%25C3%25BCche+aufgaben+pdf In PDF document text
    • https://site-1037057.mozfiles.com/files/1037057/fanoboraxoke.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/41408264470.pdfIn PDF document text
    • https://site-1037846.mozfiles.com/files/1037846/pezojeluno.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/vajovulututi.pdfIn PDF document text
    • http://files.blandinepluchet.com/uploads/1/3/1/8/131871537/xelupow_sizujigil.pdfIn PDF document text
    • http://rivobonan.yourvitality.co/uploads/1/3/1/4/131408027/6623270.pdfIn PDF document text
    • http://terisuj.drsootchimneysweep.com/uploads/1/3/0/7/130776826/5870953.pdfIn PDF document text
    • http://files.moodieshop.com/uploads/1/3/0/8/130874198/rimava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/unblocked_skull_kid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/57417514424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/reporting_capital_gains_to_hmrc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8502/7746/files/sap_gui_740_free_download_for_windows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/6232/4376/files/99926531531.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFD 5636 bytes
SHA-256: 20b798c0877ab207130767b116986907b90943ab22395ff0859bd8cee45ed059
font_01_sfnt_off000070e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E7 10936 bytes
SHA-256: f74e4d56b41bf4df16524786c380adf8da43352fb97ab90fdacac1a0e8a91d8a