Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bcafec05e1e16b…

MALICIOUS

PDF

43.3 KB Created: 2020-11-07 15:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 0826f23bd4579cb62f72e8e6a92679d1 SHA-1: ab570203cdb0aa77b95826dd899ea2a2cefa4cd4 SHA-256: a9bcafec05e1e16bf79413b185e8d3a89737f2b688adfc93292241cbc3c2a8df
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://traffset.ru/123?keyword=trump+saying+fire+and+fury PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5f8d41c279bec.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/nawosineromigi/verukik.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/david_sherrill_georgia_tech.pdfIn PDF document text
    • https://pirurupi.files.wordpress.com/2020/11/fakaxajafadamotules.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/jorojo.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/periwitenatomixi.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/wow_level_guide_90-100_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/skyrim_taarie_wife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce3e0a2-42eb-4c17-bfd8-2a51bdbe9f2e/kemafeduxuludutalobemo.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/multiplicative_inverse_reciprocal_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/tex_avery_wolf_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/xabonoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de2a210-dba5-4134-b3fd-83937eea2e46/mamibated.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/zanufofabad.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_off00006c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C45 5380 bytes
SHA-256: 1524590fac589e14773be1d99e961f24cfc5000193a11e8f60847ae6081a0571
font_01_sfnt_off00007e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E83 9788 bytes
SHA-256: ea32c409b57aa7e74a0933809c452402e78c0f332a221c93854b2245d281bcb1