Malicious PDF — malware analysis report

Static analysis result for SHA-256 957a951a64672737…

MALICIOUS

PDF

40.2 KB Created: 2020-11-04 05:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0d35f01c952398b8d240961b638cbfd0 SHA-1: f100db2e5595555eb5eb257a920f6b4e07fd7ef9 SHA-256: 957a951a64672737467676309b4f06fa7ff0a216b33038eb497ab24d72633699
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?keyword=canvas+ssu+login In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5f9d6b0eee95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_5f9a9671d60b2.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/bigax.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/taduru-pibawod-xawitafawaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5f963e1c81bdc.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/rekorewexidiwo/minor_hill_elementary_school_tn.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/acidosis_lactica_tratamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/48996765237.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/keragapufekubuluj.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/ponizaxaxusexixezidamun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d9ff71-0dd7-4eb3-9529-10b440c12ae9/36159031067.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/labview_view_as_icon_default.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A44 4724 bytes
SHA-256: 10b873cd1dacc2931e8eaa26597b2017b3e3a1801e4e658a92be33a3351b249f
font_01_sfnt_off00005a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6C 10652 bytes
SHA-256: a19f5f71853bbb33499d4ffe67522b06ed72cb4346c7796d143be80e22259859
font_02_sfnt_off00007f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F25 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3