Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5a078d22c777ee…

MALICIOUS

PDF

41.5 KB Created: 2020-11-08 04:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: dde580ae30a3d5cb85fc90691e9c0b60 SHA-1: 0c0be497d1fbc83182f4b92bd78983f37ed6ee8a SHA-256: 6a5a078d22c777ee93a6e37a65541242f8e0eff3b11572e9d642a23f8a08f289
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://trafftec.ru/aws?keyword=electron+affinity+trend+on+the+periodic+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5f93bd1ca272c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_5f93ca7c2366c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5fa528b5cce93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5f93b719a9575.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/banula/aramaic_language.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/37844995415.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/16644819857.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/pitt_party_rental_center_irwin.pdfIn PDF document text
    • https://wepizitu.files.wordpress.com/2020/11/75587379598.pdfIn PDF document text
    • https://somopewikiga768872658.files.wordpress.com/2020/11/feeding_hannibal_a_connoisseur_s_cookbook.pdfIn PDF document text
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/antonyms_in_hindi_for_ssc.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/goresosuvufat.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/cypress_springs_elementary_school_ruston.pdfIn PDF document text
    • https://rakidate.files.wordpress.com/2020/11/75526435599.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/collections_close_reader_student_edition_grade_7.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_off000065ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AE 5264 bytes
SHA-256: 76e8a570689f1b76a50828ad4bb96a48aaf6c428ef5dc070f356a5f91b922a11
font_01_sfnt_off00007794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7794 9696 bytes
SHA-256: db9baefa7ef875353dd630635b2f2e4355ad6bdc2858ec0ca9268c3b057906d8