Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f3328b15b96afc…

MALICIOUS

PDF

95.0 KB Created: 2021-03-14 16:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: e0ad70d7becf88d4955f0859b1eb4565 SHA-1: 228736f86313271c64f826c887e97cad742425a9 SHA-256: b5f3328b15b96afc7c3d908638fa9b984fa756a68a2d7544eafe7c4d7dc9c42c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to potentially malicious websites. The document body, though heavily obfuscated, appears to reference academic content to mask its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/award?keyword=abraham+maslow+y+su+teoria+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5fe3d671abe33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_602823b451a04.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/farmall_super_a_carburetor_flooding.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/sample_interview_questions_for_nursing_school.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/hoeveel_50_ml_is_een_liter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_da6522ae0d224c31b5f72687eb9f3100.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogedozara/sowesufamijug.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_0ff6ee7bee3a48e1a192c306213c3632.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/crystal_report_9._2_runtime_files.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/undertale_genocide_guide_waterfall.pdfIn PDF document text
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_dff0a0dca453496d87c6d34a94c7ae18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/87832838453.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_36806713987a4dc9a8e5e92178cef17b.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_0b50b089ecbe4077ae913d045d2ea38b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/mac_os_iso_el_capitan.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/dupanozi.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/wasotojivabaxiriwedotojik.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/which_types_of_organisms_must_be_present_in_an_ecosystem.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_68fb9df0970d48a988d081963b61a6fc.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_fd63fcc932c2425eb53299f2c2bc1177.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 5380 bytes
SHA-256: 8df2e6cdf1e9bb2d4487ad57addb37f158fc45f6ec84a1db577768b3e4547905
font_01_sfnt_off000136b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B8 12376 bytes
SHA-256: f5fcc71fe4c0f57ebfea131e8df3a1e704eca7a8fb703b45e907383be385f44d
font_02_sfnt_off00015ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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