Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2c087dec2c14e2…

MALICIOUS

PDF

125.8 KB Created: 2021-03-14 13:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bd40c7c2f97deb7d64887120a92b5b2d SHA-1: 85fd94b0429c781f09ef600ab61034eed8853086 SHA-256: 2a2c087dec2c14e2624bc2b0d02fe48704d988424d09e25aa6fba4f062d74575
106 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple suspicious links, including one that is invisible and points to a domain associated with link farming and disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the presence of embedded URIs and the nature of the heuristics suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=does+brother+support+airprint PDF link annotation
    • http://winclean-sale.shop/rirujunuh4034.pdfIn PDF document text
    • http://com-login8.xyz/photo_vault_app_iphone_deletedd5je6.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/bieChdI/ralphs_dtla_covid_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/ciapkgi/monster_hunter_clicker_hack.pdfIn PDF document text
    • https://dozadekexojigig.weebly.com/uploads/1/3/4/0/134096874/zadilafuj_jijenuwusedak_guwiresifu_wokuxirak.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/Sibwhfc/21679385951.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/voggijg/76791486807.pdfIn PDF document text
    • https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/kikarawapibibal_bisidasisifofe_vesizarofajudu_nubager.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/fexizumukonuvomes.pdfIn PDF document text
    • http://opendouche.xyz/cuanto_equivale_una_pulgada_y_media_en_milimetroshc9vm.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/30141198110.pdfIn PDF document text
    • http://dombitarf.ru/41407721565k724e.pdfIn PDF document text
    • https://ruxodinari.weebly.com/uploads/1/3/4/3/134377607/jonewofotof_lujeniduri_pijekujipuwapaj.pdfIn PDF document text
    • http://myshoes.moscow/blank_notebook_pagehpjh1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_10d14caffbcb45de80272a36952c591e.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_f423b029ff034e2496a8d2b89592ba9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d1db5e-e1cc-4e05-be36-cfb6f16f986c/49666728322.pdfIn PDF document text
    • http://gitodake.myartsonline.com/similar_shapes_worksheet_gcse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaaea244-8ed9-4fd7-9bce-66f251ab5fcb/38718699476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fcd091-9bcb-4a27-9199-5b58c99e638b/generate_bookmarks_html_file.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_59588ab7dae4476fbd00ee742fa940a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ab82d2-cd9e-42e7-aa25-01a61353bcb9/how_to_take_impression_for_implant_overdenture.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19135 3392 bytes
SHA-256: 264f7030e21e9048e7bef2bc9097a74be862775b6d841cdf7c1aeb35f42ffc37
font_01_sfnt_off00019d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D63 5016 bytes
SHA-256: 743543d2a2de7a58b61d0874cdd09c332f7dcff46d60f5d70226b12cba7fb535
font_02_sfnt_off0001ae68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE68 11848 bytes
SHA-256: 5fe3f735b47a96b8e5c1271c979805274ff16d46962c41478b7f3b925355e7c4
font_03_sfnt_off0001d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D39E 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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