Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c465125a231a12e…

MALICIOUS

PDF

72.8 KB Created: 2021-02-24 11:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: b830520f46df59452522c80e2cd5cd01 SHA-1: c8609d3acab1a4ec572a24b333c04ead62248d51 SHA-256: 8c465125a231a12e7e3d7c0dde055f8045f5d3993e874f47f67616db2948a1ac
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=unidad+2+etapa+1-ws%25231+answers In PDF document text
    • https://gezameluloxeg.weebly.com/uploads/1/3/5/3/135393377/530094.pdfIn PDF document text
    • https://kerixagagunusuz.weebly.com/uploads/1/3/0/7/130776265/9096a8b4f37fa.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/fwDkdi9/50300928772.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/1458846.pdfIn PDF document text
    • http://jilet1.club/dragons_dogma_stat_plannerop3ri.pdfIn PDF document text
    • http://vunelipu.iblogger.org/how_do_i_connect_my_logitech_wireless_mouse_without_a_receiver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenubuw.epizy.com/educated_tara_westover_book.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/dipif.pdfIn PDF document text
    • http://nuvotadaxiti.epizy.com/xopupixix.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/pafekanewarud.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/curriculum_vitae_template_free.pdfIn PDF document text
    • http://gegepemu.rf.gd/mugijek.pdfIn PDF document text
    • http://vuwepowav.epizy.com/34923178709.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/29414140866.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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 5124 bytes
SHA-256: f8c9af94da4ecb30525f49b7e617e00ebbc71f93366d07028e2b1bea7a869ebc
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 10260 bytes
SHA-256: 5365607103b6d54f3ccc21315ba99f28994df5b797991ec02969d5a02fc55bad