Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bddf10fe954d57…

MALICIOUS

PDF

72.7 KB Created: 2021-04-24 06:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b3ba48abd9d42ff9f5bd76239cb6f22d SHA-1: 83a3ed41a51578d19c35849cf3dd215c533e18d7 SHA-256: 76bddf10fe954d576a76fcbb1c2a73a654a23813827f675962ad46588e14f603
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent. Although no scripts were extracted, the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/strik?utm_term=tipos+de+esquemas PDF link annotation
    • http://luziniwanemek.sportsontheweb.net/criminal_law_examples.pdfIn PDF document text
    • https://jubezotezuwu.weebly.com/uploads/1/3/4/4/134476040/6383234.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/kewozigogusus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_6031626eae369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_60419fc927308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_6059734396936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_5fdc52bc33cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_602b3f6fab57e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_22602c33cf514e5b89f39f80bcd88225.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb134d31-04c0-4970-a157-7733c6224a16/65087648312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05396026-0499-4e05-aa3e-ee44d550c1fa/the_road_original_book_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/diary_of_a_wimpy_kid_2020_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/sunufaxok.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_c58370de714b4622a382c9bf9dc11b0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/2238355462.pdfIn PDF document text
    • http://luvetux.myartsonline.com/zajelopus.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/is_evening_primrose_oil_good_for_dogs_skin.pdfIn PDF document text
    • https://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_35983fdc828240689c6e40e1f8eadce5.pdf?index=trueIn 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_off0000decf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECF 5052 bytes
SHA-256: 69f426c3c5ef71ee52807eb3ef425dc897a56a10fc4582d4a6869be0c0432953
font_01_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 11456 bytes
SHA-256: cb545b49d6410011d5561b523bfab9bb0798fbeed0d6e0d4a884d90c985f3318

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