Malicious PDF — malware analysis report

Static analysis result for SHA-256 431a32fd7ded2a91…

MALICIOUS

PDF

39.4 KB Created: 2020-11-09 07:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f334e14faac8ebdeafde7952fb1fb732 SHA-1: 25e44dbf268c30fe5f35a06e9ed72c2c97aa87d4 SHA-256: 431a32fd7ded2a91a7c064ecddc8ed0b0aff9464ca90284dcb8d35a054a57300
76 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffset.ru/123?keyword=matrix+math+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485322/normal_5fa8a8e2f3c83.pdfIn PDF document text
    • https://jiwefirufij.weebly.com/uploads/1/3/4/3/134370204/lowatifij.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/b42cdc0d982d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376099/normal_5fa63cf686354.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/fosagoba/america_the_story_of_us_rebels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ca6f4c-405f-418e-af1b-8d2ea46c01be/15676097123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5b1d1f-68f9-416a-b7b0-776b388baa9b/faxepowodudalufikazokifiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f6f2b7-f92f-4e56-bcd2-fb5257b045b3/96631435011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f360cbd8-93de-470f-805b-787e5db3d2b7/17508528740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83950538-7f54-4db9-bab3-823c77345bee/sulekugejaxatugibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4622b76d-ec1f-4ccf-babd-bf4731fbb9f2/dezigiloruwupamivowetew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8955798-eaf8-421a-a771-547c89b9b365/jirodibiwabekixozoj.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_off00005990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5990 5124 bytes
SHA-256: 4b08e4c96c6ae961c3be2eb10de6c8b37b0af420e64ac655330fef00041eb970
font_01_sfnt_off00006af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF0 11384 bytes
SHA-256: ff81568e398c400045bcb27d452eaf1abeb2fea932deb6712e6eb4dafc64d75a