Malicious PDF — malware analysis report

Static analysis result for SHA-256 833166d8a9144310…

MALICIOUS

PDF

43.1 KB Created: 2020-11-05 19:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 4148885ad52a0651061233c94ac5a375 SHA-1: ced2f2fdba664ce66ce89c48eb929797a7cc1297 SHA-256: 833166d8a9144310ee3242f961bac80e318bde0d4c7df57ff4911f1ff8160cd7
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?keyword=ios+12+cydia+jailbreak+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f8820fd663e4.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/baruxeli_kotib_kolizazoresud_ditevolazizubak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_5f94958866bb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f8bbf521c454.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/memul/refractive_index_of_water_and_oil_project.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/epic_boss_fighter.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/footnote_before_or_after_period_bluebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f1dcba-c26a-436f-b203-ddb558d95045/degevom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7343d8ed-84ad-4318-a17a-569443bc9351/dinamica_de_integracin.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_off000067e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 5528 bytes
SHA-256: 059732440b56a663236c009859f3053dd6b09b32c264124303861afdb2cf7e5f
font_01_sfnt_off00007adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADF 10920 bytes
SHA-256: 879fa22c958d3ce65122d1e3312148b9ef28d6bf33aa14652ee0bd0cee5befe0