Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f54259875d44a0…

MALICIOUS

PDF

77.9 KB Created: 2021-03-29 05:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fdd7d30c8f75b88fc90d2b0afc5e5c6c SHA-1: 6835db2c1dc8e78425ea48d8b2bd77b08fd68ff4 SHA-256: d0f54259875d44a01263bd53511f6a64093be578b29c240a2fa23251ecbc6cb4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://dafemum.ru/award?keyword=agriculture+intelligente+definition+pdf In PDF document text
    • https://cdn.sqhk.co/wesuwajil/jaL9Ay1/photo_smudge_tool_app_ios.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/aoe_2_build_order.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/didokilegigorilim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_5fd67f4ce98f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375209/normal_5fc716e45ff91.pdfIn PDF document text
    • http://iranomics.com/49177683609ylxxu.pdfIn PDF document text
    • https://cdn.sqhk.co/tilesoxeg/jaaVdjj/banti_kumar_name_ringtone.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/kevagibawawavunuxajibab.pdfIn PDF document text
    • http://sportita.fun/fefizafexizulovoziwiwaw6e2si.pdfIn PDF document text
    • http://timecodes.net/genetic_disorders_ppt3u439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_6054cc0a960db.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/ihfkjc0/kogarasizejopawujaradu.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/download_awaken_the_giant_within.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/9sggijZ/dragon_city_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/senogewuki/0miaohj/first_aid_supplies_wholesale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca728b5-2fcd-4524-bc6d-7a46d9ce1412/casio_g-shock_ga-1100-1a1cr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03af6f7c-4284-4ad0-9c1c-790622c6f176/sanyo_blu_ray_code_for_universal_remote.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_10f21fce81064d9ca055145b642beae3.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_c442f93f664f4b90b86facac3d5cf940.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d88493-89c8-4943-8a1e-14ab43b10fa4/kenmore_elite_795_water_filter_location.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_fc1286b6819f409e830aead23640e371.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_5261f328f8d34017a884fa46be012e11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29a86cd-5e56-46e3-9e4c-20a9454f77b0/architectural_abbreviations_gl.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 4924 bytes
SHA-256: c2033af3fa7665c10f3d7dca8c889e02dac8c30dd6e5c47c09f636c4a3c756f7
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 11844 bytes
SHA-256: d74e865f4c810f74314e774f536a073159490e3c43646a06b698e58272dbcdde