Malicious PDF — malware analysis report

Static analysis result for SHA-256 819e21dbeef7e4bd…

MALICIOUS

PDF

44.0 KB Created: 2020-09-29 19:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 49ef0a331908c4e0bb72c29e4be87767 SHA-1: 7b5caf0b0ba8717f261dcfac091265818f007f26 SHA-256: 819e21dbeef7e4bde201f87f719ef990baf55bc0b359e14a7f8107ec50d7990f
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=tratamiento+para+amebiasis+intestinal+pdf In PDF document text
    • http://files.12monthbeauty.com/uploads/1/3/0/8/130874128/6301925.pdfIn PDF document text
    • http://xozalumaw.thecelestecollection.com/uploads/1/3/0/8/130874211/tedegaxo-sifisiwifekigup.pdfIn PDF document text
    • http://files.jordanodonnellauthor.com/uploads/1/3/0/7/130739601/4294640.pdfIn PDF document text
    • http://files.briannachelseydesigns.com/uploads/1/3/1/8/131856632/kibosojabikunuz-newerilovoriki-monupo.pdfIn PDF document text
    • http://files.uptodateapple.com/uploads/1/3/0/8/130874316/sisak.pdfIn PDF document text
    • http://files.seftonsupply.com/uploads/1/3/0/9/130969658/juvadaxesuduxu_xemob_batesekamuj_fixipufupaxexe.pdfIn PDF document text
    • http://files.whatsupellyj.com/uploads/1/3/0/7/130740072/9f4bf5e3.pdfIn PDF document text
    • http://tuveguk.upscaleresale4kids.com/uploads/1/3/2/8/132814930/leligujozix.pdfIn PDF document text
    • http://bumixaren.violetconner.com/uploads/1/3/1/3/131379550/lafavogunat.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/1/0479/0314/6151/files/zozusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9289/2053/files/kipefipuzaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8638/1210/files/12254171485.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1430/6467/files/wisconsin_licensed_daycare_providers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/adm_pro_apk_6._4._0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3450/7426/files/international_guideline_central.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3161/5909/files/6198335854.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/92479146246.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_off00006d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9D 5276 bytes
SHA-256: 0fe5c89af7f9c332fd6b2ac35c22c26f04a6a9de8023c9bacd6b1d2cf9e9ca92
font_01_sfnt_off00007f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F68 10404 bytes
SHA-256: 2a2a8004099f100c62120a091c96bbabd06c0cb85636d10c0fcfef8766d14dcd

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