Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1874be36653ffa…

MALICIOUS

PDF

46.4 KB Created: 2020-11-08 10:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 6dcbd9a3a936ffec971f3c77a275a3a6 SHA-1: db20aeb4da897e663e7cc16e292772cf8fd6147c SHA-256: 8a1874be36653ffa057145c04a25c57ec8cb6688a350496596533b7756be76c5
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://trafffi.ru/aws?keyword=worksheets+for+the+sight+word+blue PDF link annotation
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/tunifimiduka-selutadedev-xebiwasin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_5fa75a42f3e6f.pdfIn PDF document text
    • https://niviraxaxupo.weebly.com/uploads/1/3/4/4/134469592/xawewetasumasozix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5f9be2e68ca15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_5fa47b6619db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5f9bcb4d6cf9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rotadenig.files.wordpress.com/2020/11/82236523173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0b5db7-590a-4054-b118-7b8168a9c1f7/40201210203.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/76885188611.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/8625666511.pdfIn PDF document text
    • https://jizobote.files.wordpress.com/2020/11/didatuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/pandas_append_empty_dataframe.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/wupibakeladumimeteta.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/convection_currents_lab_worksheet_answers.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_off000073b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B7 5268 bytes
SHA-256: d2cd13e7592ecb708eed9c7536c124d2a09665b1e8d59faa83fe105bb84ac216
font_01_sfnt_off000085bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BC 11340 bytes
SHA-256: ecea1af7dbba870b792d82c9c93c1758701eeb3a63fefd0f1fa45cf69040646f