Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb29c019e2b12629…

MALICIOUS

PDF

65.4 KB Created: 2020-10-06 16:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4e77d3269ccdfa1203e636ce5203d39b SHA-1: 326a53ded21fcdff670a673004476febc374ede5 SHA-256: cb29c019e2b1262946e1fe74181b2242bc62b455c465d69c0a104c083a08bd30
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=ejercicios+suma+y+resta+de+fracciones+con+diferente+denominador+pdf In PDF document text
    • http://files.uhsbe.org/uploads/1/3/1/4/131437636/nodid.pdfIn PDF document text
    • http://zetenikuz.newleaflanguage.com/uploads/1/3/2/6/132681556/dadarubovik.pdfIn PDF document text
    • http://files.zeniegroup.com/uploads/1/3/0/8/130873850/rajis_laxobuduwilok_gonedan_kodikure.pdfIn PDF document text
    • https://site-1043620.mozfiles.com/files/1043620/kebopi.pdfIn PDF document text
    • https://site-1037215.mozfiles.com/files/1037215/11710084489.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/1/0438/3594/9218/files/74546558423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4173/6862/files/harlem_by_langston_hughes_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4149/1614/files/dickey_stephens_park_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7637/6983/files/93288378298.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8890/6902/files/zazoporigafomujal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7304/3102/files/univega_viva_sport_12_speed.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E31 5404 bytes
SHA-256: 8a5442500fa3751857b7b9119da680772c6e5851c0633e58ca1d70999f614899
font_01_sfnt_off0000b08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08E 16576 bytes
SHA-256: be2f0255b2bb5496296c7ce216873afe4e337e8a820546d303f4db20f99c4ba5
font_02_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1