Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbb2d4250341e08…

MALICIOUS

PDF

45.5 KB Created: 2020-11-07 08:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 2c132eb200b3e458e188806003b1dac9 SHA-1: 1c0e6f0bb9f33e7709d4d5e54a0e97eda1132f2f SHA-256: 8dbb2d4250341e089f6c588ab7a6ac09fc04a661ef6ff11ecc12cec30bffc01d
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/aws?keyword=june+2017+algebra+ii+regents+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421783/normal_5f9921b0c3214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f875b6780076.pdfIn PDF document text
    • https://lejiwukepefi.weebly.com/uploads/1/3/4/4/134467113/3858680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f8fb29dc97bc.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://uploads.strikinglycdn.com/files/c03f025e-a187-4bcd-bd74-d696fade8729/26733372737.pdfIn PDF document text
    • https://tafelataxuka.files.wordpress.com/2020/11/ligalumabisepinidin.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/macbeth_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/warasat.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/netter_atlas_d_anatomie_humaine.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/the_non_designers_design_book.pdfIn PDF document text
    • https://vefaxex.files.wordpress.com/2020/11/naruto_shippuden_ultimate_ninja_storm_revolution_free_download_pc_game.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://saxixukosob.files.wordpress.com/2020/11/classroom_vocabulary_worksheet.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_off000061da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DA 5252 bytes
SHA-256: 3a661e745c7eb18fd71a49bfe40b06ad1f5ea776c013e94aad94457896058c13
font_01_sfnt_off000073d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73D9 11396 bytes
SHA-256: ca432cf5ddb429143d9cd17a66cc661b366489e3579458c10b9d9b041eb8f811
font_02_sfnt_off00009ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333