Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4de0f7ef226b8c2…

MALICIOUS

PDF

40.1 KB Created: 2020-11-08 19:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: ff0117eabe0e846a0a3ada2b9e2bceba SHA-1: 70d01a5555fae5a0d44b444a87ff28ef772ee680 SHA-256: d4de0f7ef226b8c207af8288f6073d8069ff3f648d43139ef0a6f488f75fee47
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://traffset.ru/wb?keyword=street%20dance%20styles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f92646682cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f8ad562a6ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_5fa6482914699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_5fa8041697fb7.pdfIn PDF document text
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/1692507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f8ca95a92080.pdfIn PDF document text
    • https://walutosewog.weebly.com/uploads/1/3/4/3/134312240/93d8b5469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f870763bfec7.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/bupaxomu/bacterial_growth_rate.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/kuxugigirife.pdfIn PDF document text
    • https://ruvopesej.files.wordpress.com/2020/11/400_years_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/fishing_license_walmart_ca.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/ap_lang_study_guide_2020.pdfIn PDF document text
    • https://kebupud.files.wordpress.com/2020/11/16674380217.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/91895766171.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_off00005f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F62 5136 bytes
SHA-256: 1c0a69c816e89aa8eacf82a416b88fa8ee19c31d57c7b6099b539b14dd63dc98
font_01_sfnt_off000070e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E9 10224 bytes
SHA-256: 6f5a5cfda12247a61cc4b4724cc7e50c566321e93876f0553891d45db767af8c