Malicious PDF — malware analysis report

Static analysis result for SHA-256 981f8b67d81ec39d…

MALICIOUS

PDF

36.1 KB Created: 2020-11-06 19:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 65b2581435a1cb6fcbdf240c01066f5f SHA-1: c4c04e3285162909c7cd5c4ad944400ce11fa2a1 SHA-256: 981f8b67d81ec39db5205f588492860fe1192b88ad32379f96b83272c4eeabe4
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=principles+and+elements+of+design+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390663/normal_5f93432d91e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5f8dda5e902ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisik/erase_watermark_online.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/practical_reliability_engineering_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/thea_stilton_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/58376971156.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/epidemiologia_medronho.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267314ed-1271-4a9a-856a-a22c4e91e9b2/sip_of_magicka_recipe_eso.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/10607111540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f19912-8f72-40b8-87d2-fc2790f44701/69250945582.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/candidiasis_intestinal_tratamiento_farmacologico.pdfIn PDF document text
    • https://jopafez.files.wordpress.com/2020/11/furasuv.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/97629069292.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_off00004df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF0 5724 bytes
SHA-256: 956fb9d9c69b34b1fc99f8a0f51eea4329bc6599681be8105084847518fc627f
font_01_sfnt_off00006151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6151 10048 bytes
SHA-256: b90c7d51ac120a0f5d7e298e4b05367c64cca48400d7d2e48dbfe65287921c06