Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e33fad22d31a004…

MALICIOUS

PDF

53.7 KB Created: 2020-10-26 21:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6cd24483cb9984195ecbc4d57ab9ea25 SHA-1: 4aa935520079724779fa04f3a8617f70288cb018 SHA-256: 5e33fad22d31a00482580180a609b853884d5a369944f7d24c2c79fad84e04d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious domain, identified by heuristics as a redirector for phishing or malware distribution. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users into clicking it under the guise of providing educational content.

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://cctraff.ru/strik?keyword=keystone+finish+line+biology+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_5f905027c2824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5f9217162dabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f8b5e63d0e8e.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/sojebelevenex/99146224565.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/solution_of_system_of_linear_algebraic_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/65579386801.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/antenna_theory_by_balanis.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/hueso_calcaneo_anatomia.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/bienestar_animal_cerdos.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/18376698152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b75e88-fe81-4f90-9c29-4b778c9f0c79/german_wirehaired_pointer_mn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd8084a-d963-4e91-8b4f-4250947323e3/xogufukixixisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6eed181-4b6b-4d55-b19f-b3dc75376f4c/namumave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02289fce-def5-4605-9272-957bc4d134a8/37082297154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc89a45f-0aaa-4de2-a8df-66f483d468c9/sesobededajij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a25a1d-45df-43a9-85bb-be4e2b6f7725/tixubopuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f403ec4-d44c-4c3b-82aa-f4daf72785bf/rusolasavidisazuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681dcac0-1b1c-4324-bf8d-6aef89989eda/sosemuvojawonivuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc304e7-80d2-47e5-8a0c-994492dcb2af/40637037979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6851d2b-3af1-405a-b3c4-23dbedaaeeb0/pujavodufupovajuluximib.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009b39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9B39 27684 bytes
SHA-256: dbe4b928129e61d553a7c2dc491dd1f6e85f7e94f867a69069e6778cf3a03c65
font_00_sfnt_off000065e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E6 5208 bytes
SHA-256: e0289e379c5328a084ec9d14981b5bd997c42adf235ed74c80137b87dd0921ad
font_01_sfnt_off000077a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A2 10404 bytes
SHA-256: ef34b73f9b45618bccb41d92a24f3026c66d8d39a1875e7d752990c8047e1fc6