Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21f1cb25905b02b…

MALICIOUS

PDF

43.1 KB Created: 2020-11-07 20:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 40c3437dd05d442c225e27bc17aaa74b SHA-1: 520488c186f647529664fb75cdc6966f270a83f3 SHA-256: e21f1cb25905b02b4c2291bb42e386446db9a39bec87be6d458275596e32fd62
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?keyword=2015+nissan+nv+2000+value PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f901e7d7b483.pdfIn PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/mesevomu-zaganiledaruk-bezosigemetu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5f97a4d8be7f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wovitiku/sekotonuviluvarojuron.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/refanufew.pdfIn PDF document text
    • https://zovupalan.files.wordpress.com/2020/11/sigakevadixutevuxadonagur.pdfIn PDF document text
    • https://nenivegowad.files.wordpress.com/2020/11/wutadobafirixejug.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/cavite_mutiny_tagalog.pdfIn PDF document text
    • https://karepoxazul.files.wordpress.com/2020/11/barron_s_toeic_practice_exams_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/classic_eyelash_extension_training_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D44 4692 bytes
SHA-256: 67b1706685266c22c504b21ae2f98e381f7cfa7412a077bff4ac34e07cd54a74
font_01_sfnt_off00006d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D36 10816 bytes
SHA-256: 3be34166d01acf1533d34c09c2da1991c024b284c42e5e80f65353e23ee293c4
font_02_sfnt_off000091fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91FB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333