Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c40a551f3256d5…

MALICIOUS

PDF

43.9 KB Created: 2020-11-06 08:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 5a7c21c3bb3ecce90097a0ce85de6c4c SHA-1: c887ff8236e2f5a3a162df0fdf755fa664a421ce SHA-256: 31c40a551f3256d5a7c7fb933b9bb65bd69d974365a125fb64f9e7e3230cce46
76 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/strik?keyword=zeus+family+tree PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411273/normal_5f97128c5bc43.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/0d518f11-4fef-4b29-ac1c-c19c6c5af2a0/67176481378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01d8ce2-2e6d-49bb-84f2-8f9a9f0305b9/kazeguvula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a3dbc2-9c31-4443-912f-ed26d1b54ba9/49965967778.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/51601808033.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/korekizalanofuzezub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd967da-b9a5-4d5a-92f2-714f4f166bc2/btd_battles_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0e4ec5-f059-40b6-991a-530f4aedacec/66994144511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8b61e5-ca83-4abb-9396-f336d9991d32/dalesiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/cotijas_menu_bonita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7619c4ad-f511-428d-9dea-47beb07680e3/xagejiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7512c332-5268-48d4-ba75-db273f810b9f/othayadi_pathayila_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a4d237-dae0-4bbb-a042-2232487e9717/64124539538.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_off00006f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F72 4972 bytes
SHA-256: 8a455215448ffecbaf0d1f186ea17089423cee5ca79ebfd8a5bcb4f6534225eb
font_01_sfnt_off00008051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8051 10208 bytes
SHA-256: 7f43e6dd545b62da27f5805e38b3cb47c7314f68b410b39343e74e22d8ecbf95