Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f943d160580a64…

MALICIOUS

PDF

43.9 KB Created: 2020-11-06 19:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3b280128ff326b3bf6fd5353234a07e7 SHA-1: 432699701774eb1bc8d2d5a1eef7db019d5050e7 SHA-256: 81f943d160580a6451f8f611bbb023b21e00ad094e4e4ed19a30ef9f4aefd8d7
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://trafftec.ru/aws?keyword=write+a+sonnet+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409607/normal_5f9e26ad04969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f8bf70b3418a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f9502ea9091c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5f95de7eec9a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5f8c0d8e29b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f8ea0eb4a570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411245/normal_5f9971a8bffd0.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/rodigapigeta/opening_itunes_account.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228a138e-9149-41ba-9a69-f6ae1bf86783/kutavuminepolitufemudumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25aa837-9d2b-43a1-96b2-530bc30894f5/rofoferete.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/google_chromecast_ultra_black_friday_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/hindu_tamil_boy_name_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a369fb20-5c2f-484c-9a3a-0f1f8c4eaf49/xekofegetajeduvoforukosa.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/77500850901.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_off00006caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAF 4912 bytes
SHA-256: 279766e4be397e68a29769b076417e7a99c05dc8a1349497f4b29eb995ac0159
font_01_sfnt_off00007d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D76 10436 bytes
SHA-256: 277fbf67c0c4d3b323bee9a29ee1835925b42f64780ec801fc6f38ba6bf8c4eb