Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec215a5b8021ab9…

MALICIOUS

PDF

64.8 KB Created: 2021-03-22 20:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 00fac4618cbb7358fe2e1be218f2b4a4 SHA-1: ea9d719e44300f6c1cc93c674fbd398162883bb2 SHA-256: 4ec215a5b8021ab9e96698b0d4b927d2afa6ca793d52a927526631dff361cb0c
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is classified as malicious by an ML model and contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily corrupted, indicates a 'biology worksheet' theme, likely a pretext to encourage users to click the embedded links. The presence of external URIs and the ML classification strongly suggest this PDF is designed to redirect users to malicious sites.

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://pelibifir.ru/wix?keyword=types+of+selection+biology+worksheet PDF link annotation
    • https://cdn.sqhk.co/gagowuname/cgjjaCK/99552173200.pdfIn PDF document text
    • https://cdn.sqhk.co/pubusudes/jaUjbgi/11670929379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463264/normal_6002fd8f01ba8.pdfIn PDF document text
    • http://thiswaytovogue.com/behringer_pro_mixer_dx626_manualxby45.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/Ijaao9L/homemade_chocolate_oreo_cake_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/dNhhii5/kuvujorezokejetir.pdfIn PDF document text
    • http://ig-copyrightviolation.com/92971147913dm41f.pdfIn PDF document text
    • http://prostotit.site/significant_digits_addition_and_subtraction_worksheet559wj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_137b2914181d40339ae97fea8e26b1ea.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_2b4a46e886214a15bf1d8c74d5247c6f.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_c5129b079e0245e19c1e0d53ac11aff8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/redilenimo.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_9af9af6de5af451999b7f5c4375251f3.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_37af20474d99461a958d8e74b175c282.pdf?index=trueIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_dcbff65573a548269ac0969dbd5383a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/english_alphabet_for_spanish_speakers.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_f24b92274bc84ec59f651ddcc31bf512.pdf?index=trueIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_bd20fc97bafc44658976f96736ef82da.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 5416 bytes
SHA-256: 5e8f525fbf5baf6068071f2ca6ec827e645ee267f7ba9c8d67f6ad341ce25d4d
font_01_sfnt_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 10384 bytes
SHA-256: 95e50d8779c6c5d38c669a0bd214559116e4b544effbdd5497e36e8948e32c8e

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