Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd354f1f83c8055a…

MALICIOUS

PDF

39.9 KB Created: 2020-11-08 20:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 00b7ca148e62926f9479b8cf6bf4a3d5 SHA-1: 684bc77951c389beed7948cc0ae8063c368b35d3 SHA-256: cd354f1f83c8055af559070cdb7d96397b227cab6584bdfc43fc9ca9474b2956
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/123?keyword=free+guy+2020+wiki PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5f986e4f6adb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f86f5a75eed7.pdfIn PDF document text
    • https://joguwezur.weebly.com/uploads/1/3/4/5/134500750/guzanumadamo.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/rutezodosilologaxup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9934248-e72c-4649-a349-92a3633dd183/bitunovejowoxix.pdfIn PDF document text
    • https://zozonugo.files.wordpress.com/2020/11/gokumavedegadisenap.pdfIn PDF document text
    • https://nodexedi.files.wordpress.com/2020/11/89344972180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8dfc61f-0580-4d28-b9b9-2cf654f20823/nasejowibokutalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebaa030-f5ec-4b3e-9683-d3655405c0a6/a_shade_of_vampire_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/572b3e22-52aa-409e-9579-8900dcc00425/87563803877.pdfIn PDF document text
    • https://lasubujadu.files.wordpress.com/2020/11/71867889925.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_off00005f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F10 4920 bytes
SHA-256: 3426788811b4261c389be73b44e25d93734e9810be3cdd3f3bd7af0022913fdd
font_01_sfnt_off00007005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7005 10184 bytes
SHA-256: 61d0743692a5f010f6de8dcd655409e1aa7ebd91cb3021a2d4c0909ecd5f0e0f