Malicious PDF — malware analysis report

Static analysis result for SHA-256 4740a81f6df7894d…

MALICIOUS

PDF

71.7 KB Created: 2021-02-12 02:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: a428dc8cb59461384110295d1bdcd1fa SHA-1: 4408b34c1b46c989f2c0d81b17e0083d76854203 SHA-256: 4740a81f6df7894dfa1af04995c5a35c50d786b532606c5e1a91bd8ce0432f64
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=church+retreat+letter+of+encouragement+for+spiritual+retreat In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fd17c4fb1caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_5fd99da2c6c89.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/d2iiYLZ/irctc_rail_connect_website.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/hijRGia/colour_word_interference_test_d_kefs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415930/normal_6013050e4fc7e.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/b0ygijd/smartthings_lock_status.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/DieeYge/siroz.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/somamere/taloz.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/eligibility_worker_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/dofevila.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/powulobuxemulipafanuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/lixikudit.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/35043966082.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/alta_performance_monterey_ca.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/banjo_full_movie_filmywap_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/hundreds_place_value_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/jboss_application_server_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/896601677.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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 5332 bytes
SHA-256: 40ddfbab233e0afddf16813ead029726cdcd8fae13a769561f78a54e0e510c64
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 10180 bytes
SHA-256: aeb6b4ce3cadf040a4ff17fcf3e61fc0f7613e0a1def79f9b19cbb5b92b284e9