Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14f94e8f7886df7…

MALICIOUS

PDF

74.3 KB Created: 2021-03-20 16:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0815ca65644a649ff0034cada513c4ad SHA-1: 531b14bc4e31413838f45b373ea584816ec9f26d SHA-256: b14f94e8f7886df752feeda3d27e6d124cf1baaa082ced17abfd80e84a7bc5b8
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=academy+stars+2+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385862/normal_5fda1dbf5c015.pdfIn PDF document text
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/ronan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476925/normal_5fc830293aeb7.pdfIn PDF document text
    • http://geesecam.com/artificial_intelligence_in_knowledge_management_pptqfsld.pdfIn PDF document text
    • http://uscreditmonitoring.info/929865405537giwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_60406a7c326ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418175/normal_600396633ce86.pdfIn PDF document text
    • https://mikudope.weebly.com/uploads/1/3/5/3/135305195/00a33fb0cf.pdfIn PDF document text
    • http://summerita.fun/how_to_put_filter_in_keurig_selectqc1y2.pdfIn PDF document text
    • http://itclick.info/38257756153lfwkf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_603524210b23d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475194/normal_5fe1958084a03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fe2ec1eedc08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_602293d1c88b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_60527315e2938.pdfIn PDF document text
    • http://mikrotikwizard.com/trigonometry_problems_with_solutions_for_class_10mrk9p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawuvotatu.rf.gd/antecedentes_disciplinarios_policia.pdfIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_62a3d21837824c01b7593211a4a59993.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_454218ff2ff34c828769aa6aa43ebdbd.pdf?index=trueIn PDF document text
    • http://vimedunofonuw.rf.gd/vampire_diaries_season_1-3_summary.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_2790a29083744beb90db4ad476e38936.pdf?index=trueIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_15a8ca45227e4e64922afb6df7ed1bf4.pdf?index=trueIn PDF document text
    • http://wolifajutoxapas.rf.gd/99785631475.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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 6124 bytes
SHA-256: 0e7e4e4aeef812affb28938d8b13eb65c2b19f8b9d75018a21796b511c912472
font_01_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 14968 bytes
SHA-256: 7109621d31fe268af185bb4c4be48443d9b269ef9e0f4f9411baecc96582ebbd

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