Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e2c8f31a761d11…

MALICIOUS

PDF

49.0 KB Created: 2020-10-07 13:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 213fb1b7920d25453f8f3bf3786a974f SHA-1: e280cb754b91841419fc323ac6faf44df2be0aae SHA-256: 21e2c8f31a761d1184f00103445d382744cf7892f9bbf24b3c2db520d7e7c4a0
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=salary+payslip+template+free In PDF document text
    • https://site-1038944.mozfiles.com/files/1038944/najixevetopidelozetug.pdfIn PDF document text
    • https://site-1037005.mozfiles.com/files/1037005/xexotupokepud.pdfIn PDF document text
    • http://files.fatblasterpro.com/uploads/1/3/1/4/131409463/193858.pdfIn PDF document text
    • http://files.brookekellyband.com/uploads/1/3/1/1/131163563/ab39a0d6c35.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/1/0431/1747/8044/files/31194477543.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7782/4412/files/64158371174.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3052/2267/files/mathematics_formative_assessment_system_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/13263715994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2951/0814/files/silakuzowakabozubevefegos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5cc011-271b-4c7e-9904-a4d06367531b/bidupeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0628a46-b3ec-443a-b2c7-3c2d84d7843d/lidakidodido.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BD 5252 bytes
SHA-256: 3da83e71f48215bcf212ad969796ca76e163d05abdc4469551a5869c812a1499
font_01_sfnt_off00007385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7385 2744 bytes
SHA-256: c58734b7c43f876d00250fe79027c28030c899bcb97b97a165465ed91b27eb93
font_02_sfnt_off00007f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 9980 bytes
SHA-256: c566c2f5a49c2c7d528cf4a4fbf8185631971147b251d02ed992d658e834bd20
font_03_sfnt_off0000a189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA189 16148 bytes
SHA-256: d612c605d101522a7b082cd092ef78b209dae850c4a5e940dd0f53fb1bc5669f