Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78d5a584ee6a3c7…

MALICIOUS

PDF

55.1 KB Created: 2020-10-18 08:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 6502db245e197ab038f8295b0905c89c SHA-1: 25f390b35e61714be098b6df421dda84b08968b0 SHA-256: e78d5a584ee6a3c73b16e9a1cd1e71a98b2508f6661d26a491e5e8e2b8504770
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=libros+de+medicina+china+gratis+pdf In PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/400883.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/delelides_dasexurekiwar_jajumab.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/jamijodipariruvat.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/suxexisu-loxevuretifixab-puwebiti.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/luloxanibi.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/pakifupegorowa-zarawirenedofad-kokam-rebosukesure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88aae45-a2be-49d6-9c7c-0e22fec9b99a/fumijapake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc02fe43-7b00-4405-96f2-f44e8100c5ca/gunoruzoridapaket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41a0790-e094-4216-b678-812c81baaa56/sanexexeraludabowuxek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c324c7-846b-42cb-946d-f4165ee099e7/lupaxiladekegerusujowotos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb363d1-0af5-4482-baf4-32f8642b2e24/zosupowisifizamixetibanes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3532be5-0ba8-4ebb-918f-0446213dc2c0/40321060823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63e2686-24a1-48d2-bb6b-6011565ed36f/pabubinol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c05989f-c0a4-453f-9b88-02a6f15ccded/ps3_error_8001000a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617917bb-6fa1-4b46-ace0-3f0713e9c347/tewul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ae9279-2b58-4cae-a235-b3166682fcc0/44358461771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc3e7ac-166c-4342-8304-76c489e944af/28007421517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a49e5a5-a0f5-4884-95a9-2d0ad3c0e5e5/14697752411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a64127e-633e-4522-8fa6-503b18388075/xaxedumiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8713128-2e8e-4cc0-8e6f-1d3686ebeb54/27052165107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acd4b305-e61e-4b51-9ed9-bb43564d2853/31271401497.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D87 6688 bytes
SHA-256: 37fd1c0516858fe3f6e3a2f9c1e5186537892e21a6ccd3076f94d3ff6ec32567
font_01_sfnt_off000093fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93FA 5616 bytes
SHA-256: f404b4536023438a7a06f1a90bb107162de42c1d7fe3e90e2e41e94c06306c5d
font_02_sfnt_off0000a6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6DC 12108 bytes
SHA-256: 1924747937067a6884f7c9a09bb0d47276abe736dd83013e7379ef8a734efaf2