Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39ac733acd6d15a…

MALICIOUS

PDF

35.2 KB Created: 2020-10-10 17:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 92b91927a8b1811224e2abd3ab489e77 SHA-1: be8c58986147e606a37f8ab904c98321a8d6fc9b SHA-256: e39ac733acd6d15a8d9f355f3d1d4fdbaa404f74675e823533f0e994df1dfe6a
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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://ttraff.com/pify?keyword=gas+meter+cover+box In PDF document text
    • http://jexul.cmenergyinsight.com/uploads/1/3/1/3/131384721/c7df90afd6ce.pdfIn PDF document text
    • http://files.maidofclay.com/uploads/1/3/0/9/130969338/e5fabcc5eae7.pdfIn PDF document text
    • http://sumowi.premierbuildingsbandera.com/uploads/1/3/0/8/130874038/9337.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/3ebf733d-ffd4-4500-9500-494bac7459dc/13457280679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bda8fe9-b73b-4901-87e1-3c1a37780634/podasukukof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88386a18-ab4d-4724-bce6-c0ff6c3438eb/8467969163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f05b696-b37f-45b4-ba1f-65669289fd06/47746447555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d270962a-eb88-453e-97ff-6d17129f6e5c/kawokobirefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34ea90f-dc88-4ea0-9ac0-ecd75f4d36c3/34900907335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a690e2db-88c3-4f4a-b32d-613f8919b677/47057883209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3240c8b-37e1-4c9f-8fb9-3c8516011404/wevotazewidanozofonakone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b1d6f8-0763-4e14-9a6e-7d0185044d2e/3124382158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129f71da-3c1a-43f5-9cd3-24d141b04f1f/43523908470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca9805b-a67e-4e45-95a5-131d988cbb80/sipulakewolareka.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_off00004c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C7A 5212 bytes
SHA-256: de4adfd24d4b5971df8eb101243c7c092e9bebe3c82573d4033210d041130731
font_01_sfnt_off00005e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E27 10052 bytes
SHA-256: 4f9d6fca52843bd5b77c9a6b2c046b83dca63ab7bef90786915a7645b1066c50

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