Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1bd582fc249eb2…

MALICIOUS

PDF

152.8 KB Created: 2021-05-30 00:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 808c0c535e05b0c19b314d6f9fb3b75a SHA-1: de6db2fe6186118ba812be35cfc6b043b6669ad2 SHA-256: bc1bd582fc249eb2162520033b63c95e7b777067a2c9f15b5317b82fba8df073
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains an external URI and an image lure that links to an SEO redirector, identified as a free-download phishing tactic. This redirector points to a URL that likely serves as a gateway to further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • PDF carries website-builder CDN document link farm medium PDF_CDN_PDF_LINK_FARM
    PDF contains many clickable PDF links parked on website-builder CDNs or simple download gateways together with visible ebook, manual, or download lure text. This matches generated SEO document carriers used to route users through untrusted link/download chains; the PDF itself is an inert link carrier.
  • 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://botokaw.ru/123?utm_term=annamayya+cinema+songs+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd61d5a1c7fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_6027e853f29cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_6025ee8a65da7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490524/normal_5ffa96cc14eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_602070bc666a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_60167e7a0e9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_6058150b9e856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460682/normal_604893d5ef4a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fd9ac0051a12.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00020e14.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00020e14.bin)
    • http://fedorahosted.org/lohitIn extracted file (font_01_sfnt_off00021fee.bin)
    • https://uploads.strikinglycdn.com/files/4d01d39f-97ef-4ace-94e9-b9ce7616b1ec/agathiyar_books_tamil_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b698f780-35c2-45b5-94bb-648ffb4bee96/cuales_son_los_tipos_de_descripcion_y_define_cada_uno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d102ad26-fbd3-43e5-b437-01ae15e58b18/zozedokuwalubapuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1099a72a-0a7d-4c0f-9348-fd86a2f95386/my_cloud_home_wd_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcd9c6f-8b92-4660-9419-196e66fe2f82/lapovujisujuketofuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae8b0d6-aeab-41d9-a791-a1e5005591ea/difference_between_apollo_twin_duo_and_quad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db24f253-1f27-4610-b65a-5e2daff1b092/rifanadud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b12a86-6b1c-4408-96a5-22f8090dfc25/sepalekobuxewovowaxoxinij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2a108c-75bc-44a2-9172-309dd3ec78e2/drama_triangle_worksheet_what_is_your_primary_role.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1c58b0-e699-47d3-bf14-21dc736ca781/how_to_pass_minnesota_road_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf1e38d-4996-49e1-ad2f-671d09c8ef4e/marshall_as50d_acoustic_combo_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0deb036d-3e09-4b29-a1bd-e116a332a890/23214891269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9cfa37-cee8-4533-bd18-8aa3d0c2f02b/jogewopejikenego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5abd8012-37e3-42d6-b229-9950ca8b52a0/36061745951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2498751-cd68-4332-a59d-188df3420805/sennheiser_hdr_120_ii_static.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908327c8-9d7b-439d-b16a-cc37f5916094/99320038259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3b80ed-beb7-4df5-a114-f63477f82b31/survival_gear_kit_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a343981c-b4e7-409b-8262-6ba1b94c9332/70639883119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9769877-55ec-488c-890b-5ae1ae4389da/10000_reasons_song_in_tamil.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 extracted file (font_00_sfnt_off00020e14.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E14 5260 bytes
SHA-256: ca6024bbef8d7acf48c4c8bce56da9b21fb6baba91f191d789c2a831d4048e4f
font_01_sfnt_off00021fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FEE 3908 bytes
SHA-256: 18b3c7326af5ea493ae0fba78954496a6b4d3f5356133707341a9519daa12bb8
font_02_sfnt_off00022e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E97 11196 bytes
SHA-256: cea0e59fb372941426c082578b1d07ca66f95b02ebeb94047840afc4b1d11667